!8568 gfs2: Fix use-after-free in gfs2_glock_shrink_scan

Merge Pull Request from: @ci-robot 
 
PR sync from: Zhao Wenhui <zhaowenhui8@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/CN4PCF2P742ADNJ35LFVOSK24OENQSII/ 
 
https://gitee.com/src-openeuler/kernel/issues/I9R4CX 
 
Link:https://gitee.com/openeuler/kernel/pulls/8568

 

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