Simplify the Xen domain is persistent driver method

Unconditionally call xenDaemonLookupByUUID, since the XenD
driver must always be present.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

src/xen/xen_driver.c

@@ -702,7 +702,6 @@ xenUnifiedDomainIsPersistent(virDomainPtr dom)
             ret = 0;
     } else {
         /* New Xen with inactive domain management */
-        if (priv->opened[XEN_UNIFIED_XEND_OFFSET]) {
         currdom = xenDaemonLookupByUUID(dom->conn, dom->uuid);
         if (currdom) {
             if (currdom->id == -1) {
@@ -714,7 +713,6 @@ xenUnifiedDomainIsPersistent(virDomainPtr dom)
 
                 /* If its running there's no official way to tell, so we
                  * go behind xend's back & look at the config dir */
-
                 virUUIDFormat(dom->uuid, uuidstr);
                 if (virAsprintf(&path, "%s/%s", XEND_DOMAINS_DIR, uuidstr) < 0) {
                     virReportOOMError();
@@ -727,7 +725,6 @@ xenUnifiedDomainIsPersistent(virDomainPtr dom)
             }
         }
     }
-    }
 
 done:
     if (currdom)