avformat/utils: Improve ffio_limit logic
The earlier code would not complain if the remaining size was one byte short of the desired size; and the way it performed the check could run into signed integer overflow. Fixes: signed integer overflow: 9223372036854775807 + 1 cannot be represented in type 'long' Fixes: Timeout Fixes: 26434/clusterfuzz-testcase-minimized-ffmpeg_dem_MV_fuzzer-5752845451919360 Fixes: 26444/clusterfuzz-testcase-minimized-ffmpeg_dem_BINK_fuzzer-4697773380993024 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpegReviewed-by: NMichael Niedermayer <michael@niedermayer.cc> Signed-off-by: NAndreas Rheinhardt <andreas.rheinhardt@gmail.com>
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