avformat/iamf_reader: Check len before summing
Fixes: integer overflow Fixes: 67275/clusterfuzz-testcase-minimized-ffmpeg_dem_IAMF_fuzzer-5438920751906816 Fixes: 67688/clusterfuzz-testcase-minimized-ffmpeg_dem_IAMF_fuzzer-5970342318243840 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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