(cherry picked from commit 5ad38785e7ad4067a288e9d5e8ce2c4ed2bf584a)
Fixes: out of array read
Fixes: 68939/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SMC_fuzzer-587804104884224
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>