avcodec/fmvc: Check if header fields are available before allocating the image
Fixes: Timeout (15sec -> 0.5sec) Fixes: 14846/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FMVC_fuzzer-5068322120400896 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpegReviewed-by:Paul B Mahol <onemda@gmail.com> Signed-off-by:
Michael Niedermayer <michael@niedermayer.cc>
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