avcodec/hevcdec: Check ref frame
Fixes: NULL pointer dereferences Fixes: 68197/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_HEVC_fuzzer-6382538823106560 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpegReviewed-by:Andreas Rheinhardt <andreas.rheinhardt@outlook.com> Signed-off-by:
Michael Niedermayer <michael@niedermayer.cc>
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