prevent an endless loop with route-to lo0, fixes PR 3736, ok pb@, henning@, markus@
prevent an endless loop with route-to lo0, fixes PR 3736,
ok pb@, henning@, markus@

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