uniq_timestamp_us: fix variable name
uniq_timestamp_us: fix variable name

shengofsun/rDSN,shengofsun/rDSN,shengofsun/rDSN,shengofsun/rDSN,shengofsun/rDSN,shengofsun/rDSN,shengofsun/rDSN,shengofsun/rDSN