Insert missing DvcLeaveCritial() (a.k.a. splx()) before a return.
Insert missing DvcLeaveCritial() (a.k.a. splx()) before a return.

Spotted by fgsch@.

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