Fixes timeout with 847/clusterfuzz-testcase-5291877358108672
Fixes timeout with 850/clusterfuzz-testcase-5721296509861888

Found-by: continuous fuzzing process 
https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc>
---
 libavcodec/vp56.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/vp56.c b/libavcodec/vp56.c
index 9d4162bb96..bfc3d3bc7c 100644
--- a/libavcodec/vp56.c
+++ b/libavcodec/vp56.c
@@ -712,7 +712,7 @@ static int ff_vp56_decode_mbs(AVCodecContext *avctx, void 
*data,
                 int ret = vp56_decode_mb(s, mb_row, mb_col, is_alpha);
                 if (ret < 0) {
                     damaged = 1;
-                    if (!s->have_undamaged_frame) {
+                    if (!s->have_undamaged_frame || !avctx->error_concealment) 
{
                         s->discard_frame = 1;
                         return AVERROR_INVALIDDATA;
                     }
-- 
2.11.0

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