libavformat/wav.c:134: error: Uninitialized Value
  The value read from size was never initialized.

libavformat/wav.c:134:9: 
132.         url_fseek(pb, size, SEEK_CUR);
133.     }
134.     if (size < 0)
             ^
135.         size = 0x7fffffff;
136.     return size;
