libavcodec/flac.c:297: error: Uninitialized Value
  The value read from a was never initialized.

libavcodec/flac.c:297:30: 
295.         case 1:
296.             for (i = pred_order; i < blocksize; i++)
297.                 decoded[i] = a += decoded[i];
                                  ^
298.             break;
299.         case 2:
