libavcodec/flacdec.c:294: error: Uninitialized Value
  The value read from b was never initialized.

libavcodec/flacdec.c:294:9: 
292.         b = a - decoded[pred_order-2];
293.     if (pred_order > 2)
294.         c = b - decoded[pred_order-2] + decoded[pred_order-3];
             ^
295.     if (pred_order > 3)
296.         d = c - decoded[pred_order-2] + 2*decoded[pred_order-3] - decoded[pred_order-4];
