allow ic_set_key to be NULL so that drivers won't need to implement it (for instance if they don't support HW crypto).
allow ic_set_key to be NULL so that drivers won't need to implement it
(for instance if they don't support HW crypto).

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