!10320 thermal: Fix NULL pointer dereferences in of_thermal_ functions

Merge Pull Request from: @ci-robot 
 
PR sync from: Liu Mingrui <liumingrui@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/X6JHX7LEHANQYTCE5R6KX2VUP47I3RBC/ 
 
https://gitee.com/src-openeuler/kernel/issues/I9FNF5 
 
Link:https://gitee.com/openeuler/kernel/pulls/10320

 

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