avformat/kvag: Check sample_rate
Fixes: Division by 0
Fixes: -copyts -start_at_zero -itsoffset 00:00:01 -itsscale 1 -ss 00:00:02 -i zgclab/ffmpeg_crash/poc1 output.mp4
Found-by: Wang Dawei and Zhou Geng, from Zhongguancun Laboratory
Signed-off-by:
Michael Niedermayer <michael@niedermayer.cc>
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