Fixes: use-of-uninitialized-value Fixes: 70855/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MEDIA100_fuzzer-5537446610141184 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>