!9390 NFS: Fix an off by one in root_nfs_cat()

Merge Pull Request from: @ci-robot 
 
PR sync from: Wang Zhaolong <wangzhaolong1@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/IHFUF2KBZAJSYK5DK7HHY6KA2VMYX7RY/ 
 
https://gitee.com/openeuler/kernel/issues/IA7XXI 
 
Link:https://gitee.com/openeuler/kernel/pulls/9390

 

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