!5560 drm/amdgpu: Fix a use-after-free

Merge Pull Request from: @ci-robot 
 
PR sync from: GUO Zihua <guozihua@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/QYNMZ525VQAP2LGAPHPJCGJ4F6MAFIG5/ 
 
https://gitee.com/src-openeuler/kernel/issues/I9BGUB 
 
Link:https://gitee.com/openeuler/kernel/pulls/5560

 

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