interface: fix netcf based backend naming

All other backends for virInterface or other HVs implementations of
virInterface list their own names for the name instead of the generic
'Interface' value. This does the same for the netcf based backend.
Also, report any errors during registration.

src/interface/interface_backend_netcf.c

@@ -2,7 +2,7 @@
  * interface_driver.c: backend driver methods to handle physical
  *                     interface configuration using the netcf library.
  *
- * Copyright (C) 2006-2011 Red Hat, Inc.
+ * Copyright (C) 2006-2012 Red Hat, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -782,7 +782,7 @@ static int interfaceChangeRollback(virConnectPtr conn, unsigned int flags)
 #endif /* HAVE_NETCF_TRANSACTIONS */
 
 static virInterfaceDriver interfaceDriver = {
-    "Interface",
+    "netcf",
     .open = interfaceOpenInterface, /* 0.7.0 */
     .close = interfaceCloseInterface, /* 0.7.0 */
     .numOfInterfaces = interfaceNumOfInterfaces, /* 0.7.0 */
@@ -806,6 +806,10 @@ static virInterfaceDriver interfaceDriver = {
 };
 
 int interfaceRegister(void) {
-    virRegisterInterfaceDriver(&interfaceDriver);
+    if (virRegisterInterfaceDriver(&interfaceDriver) < 0) {
+        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                       _("failed to register netcf interface driver"));
+        return -1;
+    }
     return 0;
 }