diff from nordin@ to prevent wraparound on long uptime machines. ok art@ deraadt@ miod@ tdeval@
diff from nordin@ to prevent wraparound on long uptime machines.
ok art@ deraadt@ miod@ tdeval@

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars