!8146 pinctrl: single: fix potential NULL dereference

Merge Pull Request from: @ci-robot 
 
PR sync from: Yang Yingliang <yangyingliang@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/GE743FREZW2IUXJ6BDXKBDC5BWD5OZSJ/ 
 
https://gitee.com/src-openeuler/kernel/issues/I9R4L9 
 
Link:https://gitee.com/openeuler/kernel/pulls/8146

 

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