!8386 drm/nouveau/debugfs: fix file release memory leak

Merge Pull Request from: @ci-robot 
 
PR sync from: Zheng Zucheng <zhengzucheng@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/H5J3EOSEK2NBX4FZP3JRP2XCUJNA7VM5/ 
 
https://gitee.com/src-openeuler/kernel/issues/I9R4NL 
 
Link:https://gitee.com/openeuler/kernel/pulls/8386

 

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