Oops.  We do not want to unmap something that we've used bus_space_subregion to get.
Oops.  We do not want to unmap something that we've used bus_space_subregion
to get.

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