libavcodec/flac.c:305: error: Uninitialized Value
  The value read from b was never initialized.

libavcodec/flac.c:305:35: 
303.         case 3:
304.             for (i = pred_order; i < blocksize; i++)
305.                 decoded[i] = a += b += c += decoded[i];
                                       ^
306.             break;
307.         case 4:
