cgroups: Fixing comment typo

index 789471d..f81e6fd 100644
@@ -241,7 +241,7 @@ struct cgroup {
 	/*
 	 * Each non-empty css_set associated with this cgroup contributes
 	 * one to populated_cnt.  All children with non-zero popuplated_cnt
-	 * of their own contribute one.  The count is zero iff there's no
+	 * of their own contribute one.  The count is zero if there's no
 	 * task in this cgroup or its subtree.
 	 */
 	int populated_cnt;