!4277 fs:/dcache.c: fix negative dentry limit not complete problem

Merge Pull Request from: @ci-robot 
 
PR sync from: Long Li <leo.lilong@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/P6YF2R3PHVW3G7FTRR75BXQ6VA77KBOY/ 
 
https://gitee.com/openeuler/kernel/issues/I8WPQW 
 
Link:https://gitee.com/openeuler/kernel/pulls/4277

 

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