Fixes: timeout
Fixes: 1416/clusterfuzz-testcase-minimized-5536862435278848

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpegSigned-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 159fb8ff)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>