test_opus had skip uninitialized for decode-only

src/test_opus.c

@@ -106,7 +106,7 @@ int main(int argc, char *argv[])
     int packet_loss_perc;
     opus_int32 count=0, count_act=0;
     int k;
-    int skip;
+    int skip=0;
     int stop=0;
     short *in, *out;
     int application=OPUS_APPLICATION_AUDIO;