avformat/sbgdec: Check for negative duration
Fixes: signed integer overflow: 9223372036854775807 - -8000000 cannot be represented in type 'long' Fixes: 62276/clusterfuzz-testcase-minimized-ffmpeg_dem_SBG_fuzzer-5133181743136768 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpegSigned-off-by:Michael Niedermayer <michael@niedermayer.cc>
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