Merge commit '9eef9eb3'

* commit '9eef9eb3':
  h264: check that execute_decode_slices() is not called too many times

Conflicts:
	libavcodec/h264.c

The check is replaced by an assert() as the mb index should not ever go out
of bounds.
Merged-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/h264.c

@@ -4675,6 +4675,8 @@ static int execute_decode_slices(H264Context *h, int context_count)
     H264Context *hx;
     int i;
 
+    av_assert0(h->mb_y < h->mb_height);
+
     if (h->avctx->hwaccel ||
         h->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)
         return 0;