admin: Clean up error path in adminServerListClients

Coverity noted that in adminServerListClients if virNetServerGetClients
returns a -1 into ret, then the call virObjectListFreeCount in cleanup
will not be very happy.

Adjust the code to skip the cleanup label and just return -1 if
virNetServerGetClients fails.
Signed-off-by: NJohn Ferlan <jferlan@redhat.com>

daemon/admin_server.c

@@ -191,14 +191,13 @@ adminServerListClients(virNetServerPtr srv,
     virCheckFlags(0, -1);
 
     if ((ret = virNetServerGetClients(srv, &clts)) < 0)
-        goto cleanup;
+        return -1;
 
     if (clients) {
         *clients = clts;
         clts = NULL;
     }
 
- cleanup:
     virObjectListFreeCount(clts, ret);
     return ret;
 }