avformat/iff: Check data_size
Fixes: infinite loop Fixes: 27834/clusterfuzz-testcase-minimized-ffmpeg_dem_IFF_fuzzer-5694930919620608 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpegSigned-off-by: NMichael Niedermayer <michael@niedermayer.cc>
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