!5196 drm: Don't unref the same fb many times by mistake due to deadlock handling

Merge Pull Request from: @ci-robot 
 
PR sync from: Jinjie Ruan <ruanjinjie@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/EITSJTECZ2SA5XGIL54V5NJM6HMH3DJR/ 
 
https://gitee.com/src-openeuler/kernel/issues/I97NI1 
 
Link:https://gitee.com/openeuler/kernel/pulls/5196

 

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