avcodec/shorten: Check non COMM chunk len before skip in decode_aiff_header()
Fixes: signed integer overflow: 2147483647 + 1 cannot be represented in type 'int' Fixes: 8024/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SHORTEN_fuzzer-5109204648984576 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpegSigned-off-by: Michael Niedermayer <michael@niedermayer.cc>
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