!8188 v2 ACPI: video: check for error while searching for backlight device parent

Merge Pull Request from: @ci-robot 
 
PR sync from: Yu Liao <liaoyu15@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/N6KZOHYILBEM25JLHVPANDZXCZNWO6U7/ 
 
https://gitee.com/src-openeuler/kernel/issues/I9Q9CJ 
 
Link:https://gitee.com/openeuler/kernel/pulls/8188

 

Reviewed-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Reviewed-by: Liu YongQiang <liuyongqiang13@huawei.com>
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>