In extent_destroy(), only remove the extent from the global extent list if the list is really used, i.e. if option DIAGNOSTIC || option DDB.
In extent_destroy(), only remove the extent from the global extent list if
the list is really used, i.e. if option DIAGNOSTIC || option DDB.

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