* there no point in configuring the device if realization is going to
fail, so move the check to the beginning,
* create a separate function for the check,
* use error_setg() instead error_report().
Reviewed-by: Igor Mammedov <imammedo@redhat.com> Reviewed-by: Peter Xu <peterx@redhat.com> Signed-off-by: Radim Krčmář <rkrcmar@redhat.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>