libavcodec/flacdec.c:303: error: Uninitialized Value
  The value read from a was never initialized.

libavcodec/flacdec.c:303:26: 
301.     case 1:
302.         for (i = pred_order; i < blocksize; i++)
303.             decoded[i] = a += decoded[i];
                              ^
304.         break;
305.     case 2:
