!9206 v2 sched: smart_grid: fix potential NULL pointer dereference

Merge Pull Request from: @ci-robot 
 
PR sync from: Yipeng Zou <zouyipeng@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/PZ5GN5BTFMN4NAK6CLI4UC5A4JT2WTIS/ 
 
https://gitee.com/openeuler/kernel/issues/IA6J1H 
 
Link:https://gitee.com/openeuler/kernel/pulls/9206

 

Reviewed-by: Zhang Jianhua <chris.zjh@huawei.com>
Reviewed-by: Liu YongQiang <liuyongqiang13@huawei.com>
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>