libavcodec/mpeg4videodec: Convert sprite_offset to 64bit
This avoids intermediates from overflowing (the final values are checked) Fixes: runtime error: signed integer overflow: -167712 + -2147352576 cannot be represented in type 'int' Fixes: 1298/clusterfuzz-testcase-minimized-5955580877340672 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpegSigned-off-by:Michael Niedermayer <michael@niedermayer.cc>
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