pmap_remove_mapping() uses an unnecessary PHYS_TO_VM_PAGE call. Instead of simply removing it, slightly reorganize the code to remove a pg_to_pvh() call as well.
pmap_remove_mapping() uses an unnecessary PHYS_TO_VM_PAGE call. Instead of
simply removing it, slightly reorganize the code to remove a pg_to_pvh() call
as well.

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