Fixes: Timeout (long -> 95ms)
Fixes: 29068/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FLV_fuzzer-6509662832820224

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpegSigned-off-by: Michael Niedermayer <michael@niedermayer.cc>