Explicitly discard fwrite/fread return values

Using if(); triggers an empty body warning with clang

Change-Id: I0fa2ee676400a974b40f8eaafca9ae668107eebb

examples/decoder_tmpl.txt

@@ -48,8 +48,8 @@ for(plane=0; plane < 3; plane++) {
     unsigned char *buf =img->planes[plane];
 
     for(y=0; y < (plane ? (img->d_h + 1) >> 1 : img->d_h); y++) {
-        if(fwrite(buf, 1, (plane ? (img->d_w + 1) >> 1 : img->d_w),
-           outfile));
+        (void) fwrite(buf, 1, (plane ? (img->d_w + 1) >> 1 : img->d_w),
+                      outfile);
         buf += img->stride[plane];
     }
 }

examples/encoder_tmpl.c

@@ -85,7 +85,7 @@ static void write_ivf_file_header(FILE *outfile,
     mem_put_le32(header+24, frame_cnt);           /* length */
     mem_put_le32(header+28, 0);                   /* unused */
 
-    if(fwrite(header, 1, 32, outfile));
+    (void) fwrite(header, 1, 32, outfile);
 }
 
 
@@ -103,7 +103,7 @@ static void write_ivf_frame_header(FILE *outfile,
     mem_put_le32(header+4, pts&0xFFFFFFFF);
     mem_put_le32(header+8, pts >> 32);
 
-    if(fwrite(header, 1, 12, outfile));
+    (void) fwrite(header, 1, 12, outfile);
 }
 
 int main(int argc, char **argv) {

examples/encoder_tmpl.txt

@@ -61,8 +61,8 @@ if(vpx_codec_encode(&codec, frame_avail? &raw : NULL, frame_cnt,
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ PROCESS_FRAME
 case VPX_CODEC_CX_FRAME_PKT:
     write_ivf_frame_header(outfile, pkt);
-    if(fwrite(pkt->data.frame.buf, 1, pkt->data.frame.sz,
-              outfile));
+    (void) fwrite(pkt->data.frame.buf, 1, pkt->data.frame.sz,
+                  outfile);
     break;
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ PROCESS_FRAME
 

vp8/encoder/firstpass.c

@@ -853,7 +853,8 @@ skip_motion_search:
         else
             recon_file = fopen(filename, "ab");
 
-        if(fwrite(lst_yv12->buffer_alloc, lst_yv12->frame_size, 1, recon_file));
+        (void) fwrite(lst_yv12->buffer_alloc, lst_yv12->frame_size, 1,
+                      recon_file);
         fclose(recon_file);
     }
 

vp8_multi_resolution_encoder.c

@@ -164,7 +164,7 @@ static void write_ivf_file_header(FILE *outfile,
     mem_put_le32(header+24, frame_cnt);           /* length */
     mem_put_le32(header+28, 0);                   /* unused */
 
-    if(fwrite(header, 1, 32, outfile));
+    (void) fwrite(header, 1, 32, outfile);
 }
 
 static void write_ivf_frame_header(FILE *outfile,
@@ -181,7 +181,7 @@ static void write_ivf_frame_header(FILE *outfile,
     mem_put_le32(header+4, pts&0xFFFFFFFF);
     mem_put_le32(header+8, pts >> 32);
 
-    if(fwrite(header, 1, 12, outfile));
+    (void) fwrite(header, 1, 12, outfile);
 }
 
 int main(int argc, char **argv)
@@ -410,8 +410,8 @@ int main(int argc, char **argv)
                 switch(pkt[i]->kind) {
                     case VPX_CODEC_CX_FRAME_PKT:
                         write_ivf_frame_header(outfile[i], pkt[i]);
-                        if(fwrite(pkt[i]->data.frame.buf, 1, pkt[i]->data.frame.sz,
-                                  outfile[i]));
+                        (void) fwrite(pkt[i]->data.frame.buf, 1,
+                                      pkt[i]->data.frame.sz, outfile[i]);
                     break;
                     case VPX_CODEC_PSNR_PKT:
                         if (show_psnr)

vp8_scalable_patterns.c

@@ -93,7 +93,7 @@ static void write_ivf_file_header(FILE *outfile,
     mem_put_le32(header+24, frame_cnt);           /* length */
     mem_put_le32(header+28, 0);                   /* unused */
 
-    if(fwrite(header, 1, 32, outfile));
+    (void) fwrite(header, 1, 32, outfile);
 }
 
 
@@ -111,7 +111,7 @@ static void write_ivf_frame_header(FILE *outfile,
     mem_put_le32(header+4, pts&0xFFFFFFFF);
     mem_put_le32(header+8, pts >> 32);
 
-    if(fwrite(header, 1, 12, outfile));
+    (void) fwrite(header, 1, 12, outfile);
 }
 
 static int mode_to_num_layers[9] = {2, 2, 3, 3, 3, 3, 5, 2, 3};
@@ -530,8 +530,8 @@ int main(int argc, char **argv) {
                                               i<cfg.ts_number_layers; i++)
                 {
                     write_ivf_frame_header(outfile[i], pkt);
-                    if (fwrite(pkt->data.frame.buf, 1, pkt->data.frame.sz,
-                              outfile[i]));
+                    (void) fwrite(pkt->data.frame.buf, 1, pkt->data.frame.sz,
+                                  outfile[i]);
                     frames_in_layer[i]++;
                 }
                 break;
@@ -562,4 +562,3 @@ int main(int argc, char **argv) {
 
     return EXIT_SUCCESS;
 }
-

vpxdec.c

@@ -356,7 +356,7 @@ void out_put(void *out, const uint8_t *buf, unsigned int len, int do_md5)
     }
     else
     {
-        if(fwrite(buf, 1, len, out));
+        (void) fwrite(buf, 1, len, out);
     }
 }
 

vpxenc.c

@@ -245,7 +245,7 @@ void stats_write(stats_io_t *stats, const void *pkt, size_t len)
 {
     if (stats->file)
     {
-        if(fwrite(pkt, 1, len, stats->file));
+        (void) fwrite(pkt, 1, len, stats->file);
     }
     else
     {
@@ -338,7 +338,7 @@ static int read_frame(struct input_state *input, vpx_image_t *img)
              * write_ivf_frame_header() for documentation on the frame header
              * layout.
              */
-            if(fread(junk, 1, IVF_FRAME_HDR_SZ, f));
+            (void) fread(junk, 1, IVF_FRAME_HDR_SZ, f);
         }
 
         for (plane = 0; plane < 3; plane++)
@@ -468,7 +468,7 @@ static void write_ivf_file_header(FILE *outfile,
     mem_put_le32(header + 24, frame_cnt);         /* length */
     mem_put_le32(header + 28, 0);                 /* unused */
 
-    if(fwrite(header, 1, 32, outfile));
+    (void) fwrite(header, 1, 32, outfile);
 }
 
 
@@ -486,14 +486,14 @@ static void write_ivf_frame_header(FILE *outfile,
     mem_put_le32(header + 4, pts & 0xFFFFFFFF);
     mem_put_le32(header + 8, pts >> 32);
 
-    if(fwrite(header, 1, 12, outfile));
+    (void) fwrite(header, 1, 12, outfile);
 }
 
 static void write_ivf_frame_size(FILE *outfile, size_t size)
 {
     char             header[4];
     mem_put_le32(header, size);
-    fwrite(header, 1, 4, outfile);
+    (void) fwrite(header, 1, 4, outfile);
 }
 
 
@@ -541,7 +541,7 @@ struct EbmlGlobal
 
 void Ebml_Write(EbmlGlobal *glob, const void *buffer_in, unsigned long len)
 {
-    if(fwrite(buffer_in, 1, len, glob->stream));
+    (void) fwrite(buffer_in, 1, len, glob->stream);
 }
 
 #define WRITE_BUFFER(s) \
@@ -2259,8 +2259,8 @@ static void get_cx_data(struct stream_state  *stream,
                     }
                 }
 
-                fwrite(pkt->data.frame.buf, 1,
-                       pkt->data.frame.sz, stream->file);
+                (void) fwrite(pkt->data.frame.buf, 1, pkt->data.frame.sz,
+                              stream->file);
             }
             stream->nbytes += pkt->data.raw.sz;
             break;