libavcodec/flacdec.c:315: error: Uninitialized Value
  The value read from b was never initialized.

libavcodec/flacdec.c:315:31: 
313.     case 4:
314.         for (i = pred_order; i < blocksize; i++)
315.             decoded[i] = a += b += c += d += decoded[i];
                                   ^
316.         break;
317.     default:
