avformat/av1dec: check size before addition in probing
Fixes: signed integer overflow: 175 + 2147483571 cannot be represented in type 'int' Fixes: 26833/clusterfuzz-testcase-minimized-ffmpeg_dem_IMAGE2_fuzzer-5969501214212096 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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