!4898 platform/x86: dell-smbios-wmi: Fix oops on rmmod dell_smbios

Merge Pull Request from: @ci-robot 
 
PR sync from: Zheng Yejian <zhengyejian1@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/DAN7BNXC6X6UCFQZRZIJIAO2QP6T4F3M/ 
 
https://gitee.com/src-openeuler/kernel/issues/I956GN 
 
Link:https://gitee.com/openeuler/kernel/pulls/4898

 

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