!10693 drm/nouveau/dispnv04: fix null pointer dereference in nv17_tv_get_ld_modes

Merge Pull Request from: @ci-robot 
 
PR sync from: Yuan Can <yuancan@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/R4NELJGYFQG5SF2LWLPSQPG6RDUFJ2I2/ 
 
https://gitee.com/src-openeuler/kernel/issues/IAGENV 
 
Link:https://gitee.com/openeuler/kernel/pulls/10693

 

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