fixed the following coccicheck:
drivers/pcmcia/cistpl.c:1557:54-55: WARNING opportunity for kobj_to_dev()
drivers/pcmcia/cistpl.c:1584:53-54: WARNING opportunity for kobj_to_dev()
Signed-off-by: Tian Tao <tiantao6@hisilicon.com>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
                if (off + count > size)
                        count = size - off;
 
-               s = to_socket(container_of(kobj, struct device, kobj));
+               s = to_socket(kobj_to_dev(kobj));
 
                if (!(s->state & SOCKET_PRESENT))
                        return -ENODEV;
        if (error)
                return error;
 
-       s = to_socket(container_of(kobj, struct device, kobj));
+       s = to_socket(kobj_to_dev(kobj));
 
        if (off)
                return -EINVAL;