mm: memcontrol - uninitialised return value

Only an out of memory error will cause ret to be set.

Signed-off-by: Phil Carmody <ext-phil.2.carmody@nokia.com>
Acked-by: Kirill A. Shutemov <kirill@shutemov.name>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/memcontrol.c

@@ -3563,7 +3563,7 @@ static int mem_cgroup_usage_unregister_event(struct cgroup *cgrp,
 	int type = MEMFILE_TYPE(cft->private);
 	u64 usage;
 	int size = 0;
-	int i, j, ret;
+	int i, j, ret = 0;
 
 	mutex_lock(&memcg->thresholds_lock);
 	if (type == _MEM)