libavcodec/mjpegdec.c:542: error: Uninitialized Value
  The value read from left[_] was never initialized.

libavcodec/mjpegdec.c:542:17: 
540.                 top[i]= buffer[mb_x][i];
541. 
542.                 PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
                     ^
543. 
544.                 left[i]=
