Don't dereference scrub pointer when it's NULL, fix PR 3775, from Marc Huber. ok deraadt@
Don't dereference scrub pointer when it's NULL, fix PR 3775, from
Marc Huber. ok deraadt@

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