!4255 drm/amdgpu: Fix potential fence use-after-free v2

Merge Pull Request from: @ci-robot 
 
PR sync from: GUO Zihua <guozihua@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/VOH63IKM2FSSI5CULEGOZJNL75B7KN57/ 
 
https://gitee.com/src-openeuler/kernel/issues/I8YD58 
 
Link:https://gitee.com/openeuler/kernel/pulls/4255

 

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