trivial: fu-udev-device: add some safety checks for fd
trivial: fu-udev-device: add some safety checks for fd

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