!10121 usb: f_fs: Fix use-after-free for epfile

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/O72CBUWM4PSH6NRXFIAXMCG4BBRCC5FB/ 
 
https://gitee.com/src-openeuler/kernel/issues/IADGRE 
 
Link:https://gitee.com/openeuler/kernel/pulls/10121

 

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