trivial: Fix the last -Wpointer-sign warning
trivial: Fix the last -Wpointer-sign warning

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