libavcodec/flacdec.c:307: error: Uninitialized Value
  The value read from b was never initialized.

libavcodec/flacdec.c:307:31: 
305.     case 2:
306.         for (i = pred_order; i < blocksize; i++)
307.             decoded[i] = a += b += decoded[i];
                                   ^
308.         break;
309.     case 3:
