Pass a real dev_t to readdisklabel(), not a unit number with lipstick.
Pass a real dev_t to readdisklabel(), not a unit number with lipstick.

Suggestions from miod@, KNF nit from mk@

ok miod@ millert@

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