mm: Convert vmalloc/memset to vzalloc

Signed-off-by: NJoe Perches <joe@perches.com>
Acked-by: NPaul Menage <menage@google.com>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

mm/page_cgroup.c

@@ -513,11 +513,10 @@ int swap_cgroup_swapon(int type, unsigned long max_pages)
 	length = DIV_ROUND_UP(max_pages, SC_PER_PAGE);
 	array_size = length * sizeof(void *);
 
-	array = vmalloc(array_size);
+	array = vzalloc(array_size);
 	if (!array)
 		goto nomem;
 
-	memset(array, 0, array_size);
 	ctrl = &swap_cgroup_ctrl[type];
 	mutex_lock(&swap_cgroup_mutex);
 	ctrl->length = length;