Use kobj_to_dev() instead of container_of().
Signed-off-by: Wang Qing <wangqing@vivo.com>
Link: https://lore.kernel.org/r/1592035604-22336-1-git-send-email-wangqing@vivo.comSigned-off-by: Guenter Roeck <linux@roeck-us.net>