Initialize postproc buffer to resolve valgrind warnings

Change-Id: I9a7d40b0eac7200796dbe62e75776b2eb77dfdf6

vp8/common/alloccommon.c

@@ -106,8 +106,8 @@ int vp8_alloc_frame_buffers(VP8_COMMON *oci, int width, int height)
     }
 
     oci->post_proc_buffer_int_used = 0;
-
     vpx_memset(&oci->postproc_state, 0, sizeof(oci->postproc_state));
+    vpx_memset((&oci->post_proc_buffer)->buffer_alloc,128,(&oci->post_proc_buffer)->frame_size);
 #endif
 
     oci->mb_rows = height >> 4;

vp8/common/postproc.c

@@ -737,7 +737,7 @@ int vp8_post_proc_frame(VP8_COMMON *oci, YV12_BUFFER_CONFIG *dest, vp8_ppflags_t
 
             // insure that postproc is set to all 0's so that post proc
             // doesn't pull random data in from edge
-            vpx_memset((&oci->post_proc_buffer_int)->buffer_alloc,126,(&oci->post_proc_buffer)->frame_size);
+            vpx_memset((&oci->post_proc_buffer_int)->buffer_alloc,128,(&oci->post_proc_buffer)->frame_size);
 
         }
     }