libavcodec/flac.c:285: error: Uninitialized Value
  The value read from a was never initialized.

libavcodec/flac.c:285:9: 
283.         a = decoded[pred_order-1];
284.     if(pred_order > 1)
285.         b = a - decoded[pred_order-2];
             ^
286.     if(pred_order > 2)
287.         c = b - decoded[pred_order-2] + decoded[pred_order-3];
