fu-tool: fix array access in fw_util_verify_update
fu-tool: fix array access in fw_util_verify_update

fwupd/fwupd,hughsie/fwupd,hughsie/fwupd,hughsie/fwupd,fwupd/fwupd,hughsie/fwupd,fwupd/fwupd,fwupd/fwupd