trivial: Fix a with fu-csr-tool bug spotted by Coverity
trivial: Fix a with fu-csr-tool bug spotted by Coverity

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