hlsdemux2/m3u8: use GstClockTimeDiff to do timestamp comparison
Use GstClockTimeDiff to do timestamp comparison when look for matched segment. Otherwise there is chance that "Couldn't find a match" when expected ts is a negative value.
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Use GstClockTimeDiff to do timestamp comparison when look for matched segment. Otherwise there is chance that "Couldn't find a match" when expected ts is a negative value.