!6845 erofs: fix pcluster use-after-free on UP platforms

Merge Pull Request from: @ci-robot 
 
PR sync from: Zizhi Wo <wozizhi@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/5Z2MI5GFWOUUNIKNKFG73EAFVRURYJJ2/ 
 
https://gitee.com/src-openeuler/kernel/issues/I9LK3Y 
 
Link:https://gitee.com/openeuler/kernel/pulls/6845

 

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