mm: refactor register_cpu_under_node()

By returning early if the node is not online, we can unindent the
interesting code by one level.

No functional change.
Signed-off-by: Alex Chiang <achiang@hp.com>
Cc: Gary Hade <garyhade@us.ibm.com>
Cc: Badari Pulavarty <pbadari@us.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: David Rientjes <rientjes@google.com>
Cc: Greg KH <greg@kroah.com>
Cc: Randy Dunlap <randy.dunlap@oracle.com>
Cc: David Rientjes <rientjes@google.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/base/node.c

@@ -271,16 +271,18 @@ struct node node_devices[MAX_NUMNODES];
  */
 int register_cpu_under_node(unsigned int cpu, unsigned int nid)
 {
-	if (node_online(nid)) {
-		struct sys_device *obj = get_cpu_sysdev(cpu);
+	struct sys_device *obj;
+
+	if (!node_online(nid))
+		return 0;
+
+	obj = get_cpu_sysdev(cpu);
 	if (!obj)
 		return 0;
+
 	return sysfs_create_link(&node_devices[nid].sysdev.kobj,
 				&obj->kobj,
 				kobject_name(&obj->kobj));
-	 }
-
-	return 0;
 }
 
 int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)