virt-host-validate: Call VIR_HOST_VALIDATE_FAILURE() more frequently
virt-host-validate: Call VIR_HOST_VALIDATE_FAILURE() more frequently

Ideally, every virHostMsgFail() would be coupled with
VIR_HOST_VALIDATE_FAILURE() so that the failure is correctly
propagated to the caller. However, in
virHostValidateSecureGuests() we are either ignoring @level and
returning 0 directly (no error), or not returning at all, relying
on 'return 0' at the end of the function. Neither of these help
propagate failure correctly.

Signed-off-by: Michal Privoznik <83d82aaba2eed257f4814b0c239c260c4caaadf0@redhat.com>
Reviewed-by: Ján Tomko <4cab11cfb98d3c937327354a78eb07dbb6ee2bc6@redhat.com>
Reviewed-by: Fabiano Fidêncio <d95e9796398a6087d3fb67947e5776c26b264733@fidencio.org>

jfehlig/libvirt,crobinso/libvirt,nertpinx/libvirt,olafhering/libvirt,olafhering/libvirt,libvirt/libvirt,nertpinx/libvirt,olafhering/libvirt,nertpinx/libvirt,libvirt/libvirt,nertpinx/libvirt,crobinso/libvirt,zippy2/libvirt,libvirt/libvirt,nertpinx/libvirt,zippy2/libvirt,crobinso/libvirt,libvirt/libvirt,olafhering/libvirt,zippy2/libvirt,jfehlig/libvirt,jfehlig/libvirt,jfehlig/libvirt,crobinso/libvirt,zippy2/libvirt