This does not replicate on my setup, thus this is a blind fix based on ossfuzz 
trace

Fixes: use of uninitialized value
Fixes: 
71747/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_HEVC_fuzzer-5427736120721408

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

diff --git a/libavcodec/hevc/hevcdec.c b/libavcodec/hevc/hevcdec.c
index d915d74d22e..0b50bbd2754 100644
--- a/libavcodec/hevc/hevcdec.c
+++ b/libavcodec/hevc/hevcdec.c
@@ -127,7 +127,7 @@ static int pic_arrays_init(HEVCLayerContext *l, const 
HEVCSPS *sps)
     l->filter_slice_edges = av_mallocz(ctb_count);
     l->tab_slice_address  = av_malloc_array(pic_size_in_ctb,
                                       sizeof(*l->tab_slice_address));
-    l->qp_y_tab           = av_malloc_array(pic_size_in_ctb,
+    l->qp_y_tab           = av_calloc(pic_size_in_ctb,
                                       sizeof(*l->qp_y_tab));
     if (!l->qp_y_tab || !l->filter_slice_edges || !l->tab_slice_address)
         goto fail;
-- 
2.46.1

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