avformat/utils: Use av_sat_sub64() in max_analyze_duration check
Fixes: signed integer overflow: 9223372036854710272 - -541165944832 cannot be represented in type 'long' Fixes: 27000/clusterfuzz-testcase-minimized-ffmpeg_dem_IVF_fuzzer-5643670608674816 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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