Mask off the highest 16 bit of the io space address. Problem reported by kocka@hysteria.hu.
Mask off the highest 16 bit of the io space address.
Problem reported by kocka@hysteria.hu.

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