kernel: power: swap: use kzalloc() instead of kmalloc() followed by memset()

Use zeroing allocator instead of using allocator
followed with memset with 0
Signed-off-by: NFuqian Huang <huangfq.daxian@gmail.com>
Acked-by: NPavel Machek <pavel@ucw.cz>
[ rjw: Subject ]
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>

kernel/power/swap.c

@@ -974,12 +974,11 @@ static int get_swap_reader(struct swap_map_handle *handle,
 	last = handle->maps = NULL;
 	offset = swsusp_header->image;
 	while (offset) {
-		tmp = kmalloc(sizeof(*handle->maps), GFP_KERNEL);
+		tmp = kzalloc(sizeof(*handle->maps), GFP_KERNEL);
 		if (!tmp) {
 			release_swap_reader(handle);
 			return -ENOMEM;
 		}
-		memset(tmp, 0, sizeof(*tmp));
 		if (!handle->maps)
 			handle->maps = tmp;
 		if (last)