avformat/mvi: Use 64bit for testing dimensions
Fixes: signed integer overflow: 65535 * 65535 cannot be represented in type 'int' Fixes: 26910/clusterfuzz-testcase-minimized-ffmpeg_dem_MVI_fuzzer-6649291124899840 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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