add detach support. this has to be the easiest diff for hotplug ever, go read it :)
add detach support. this has to be the easiest diff for hotplug ever, go
read it :)

ok kettenis@ jsg@

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