libavcodec/pnm.c:49: error: Uninitialized Value
  The value read from c was never initialized.

libavcodec/pnm.c:49:13: 
47.     while (sc->bytestream < sc->bytestream_end && !pnm_space(c)) {
48.         if ((s - str)  < buf_size - 1)
49.             *s++ = c;
                ^
50.         c = *sc->bytestream++;
51.     }
