Simplify the Xen get type driver method

There is no point iterating over sub-drivers since the user
would not have a virConnectPtr instance at all if opening
the drivers failed. Just return 'Xen' immediately.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

src/xen/xen_driver.c

@@ -491,16 +491,9 @@ unsigned long xenUnifiedVersion(void)
 
 
 static const char *
-xenUnifiedConnectGetType(virConnectPtr conn)
+xenUnifiedConnectGetType(virConnectPtr conn ATTRIBUTE_UNUSED)
 {
-    xenUnifiedPrivatePtr priv = conn->privateData;
-    int i;
-
-    for (i = 0; i < XEN_UNIFIED_NR_DRIVERS; ++i)
-        if (priv->opened[i])
     return "Xen";
-
-    return NULL;
 }
 
 /* Which features are supported by this driver? */