Exit immediately from update_required_by()
Exit immediately from update_required_by()

The function is not going to be called anyway, but this change ensures
it cannot do any damage.

Open343/pkg,khorben/pkg,junovitch/pkg,khorben/pkg,Open343/pkg,skoef/pkg,skoef/pkg,junovitch/pkg,khorben/pkg,en90/pkg,en90/pkg