!13899  drm/amd/display: Check link_index before accessing dc->links[

Merge Pull Request from: @ci-robot 
 
PR sync from: quzicheng <quzicheng@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/UU6LVNOITYFYTOA2V4HPBFRM4GG5GS2Z/ 
 
https://gitee.com/src-openeuler/kernel/issues/IAU9QT 
 
Link:https://gitee.com/openeuler/kernel/pulls/13899 

Reviewed-by: Li Nan <linan122@huawei.com> 
Signed-off-by: Li Nan <linan122@huawei.com>