libavcodec/flac.c:287: error: Uninitialized Value
  The value read from b was never initialized.

libavcodec/flac.c:287:9: 
285.         b = a - decoded[pred_order-2];
286.     if(pred_order > 2)
287.         c = b - decoded[pred_order-2] + decoded[pred_order-3];
             ^
288.     if(pred_order > 3)
289.         d = c - decoded[pred_order-2] + 2*decoded[pred_order-3] - decoded[pred_order-4];
