libavcodec/pnm.c:47: error: Uninitialized Value
  The value read from c was never initialized.

libavcodec/pnm.c:47:52: 
45. 
46.     s = str;
47.     while (sc->bytestream < sc->bytestream_end && !pnm_space(c)) {
                                                       ^
48.         if ((s - str)  < buf_size - 1)
49.             *s++ = c;
