!9539 ext4: fix mb_cache_entry's e_refcnt leak in ext4_xattr_block_cache_find()

Merge Pull Request from: @ci-robot 
 
PR sync from: Baokun Li <libaokun1@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/MNAPMHNIMO25VPQMYQGNWRMXUCE5ZT4J/ 
 
https://gitee.com/src-openeuler/kernel/issues/IA8AER 
 
Link:https://gitee.com/openeuler/kernel/pulls/9539

 

Reviewed-by: zhangyi (F) <yi.zhang@huawei.com>
Reviewed-by: Liu YongQiang <liuyongqiang13@huawei.com>
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>