Fix get-results for UEFI provider.
Fix get-results for UEFI provider.

Even though fwupd doesn't display any information about when,
libfwup will fail to return data unless it gets a pointer.

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