trivial: uefi: Don't return NULL matching devices
trivial: uefi: Don't return NULL matching devices

Fixes: 988e73c414e866483dd07fc8aeb37bf65aab9e44

hughsie/fwupd,hughsie/fwupd,fwupd/fwupd,fwupd/fwupd,vathpela/fwupd,superm1/fwupd,hughsie/fwupd,fwupd/fwupd,superm1/fwupd,vathpela/fwupd,superm1/fwupd,fwupd/fwupd,vathpela/fwupd,vathpela/fwupd,hughsie/fwupd