uefi: fix segfault in fwup_set_update_statuses
uefi: fix segfault in fwup_set_update_statuses

If the near-zero memory region is populated, this caused UEFI
updates to get stuck trying to deref random pointers.

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