cgroup: fix memory leak in cgroup_get_sb()

opts.release_agent is not kfree()ed in all necessary places.

Signed-off-by: Li Zefan <[e-mail]>
Acked-by: Paul Menage <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

kernel/cgroup.c

···
 	}
 
 	root = kzalloc(sizeof(*root), GFP_KERNEL);
-	if (!root)
+	if (!root) {
+		if (opts.release_agent)
+			kfree(opts.release_agent);
 		return -ENOMEM;
+	}
 
 	init_cgroup_root(root);
 	root->subsys_bits = opts.subsys_bits;