trivial: Fix starting conditions in the self tests
trivial: Fix starting conditions in the self tests

Found using Coverity.

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