!6827 fat: fix uninitialized field in nostale filehandles

Merge Pull Request from: @ci-robot 
 
PR sync from: Yifan Qiao <qiaoyifan4@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/WVNXP2X7REREVJPSBWS7GXAJOTSJFLNY/ 
 
https://gitee.com/src-openeuler/kernel/issues/I9L5QJ 
 
Link:https://gitee.com/openeuler/kernel/pulls/6827

 

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