!9407 drm/arm/malidp: fix a possible null pointer dereference

Merge Pull Request from: @ci-robot 
 
PR sync from: Chen Zhongjin <chenzhongjin@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/LXIOQP7CIMJSNN6UQK2VNLU3B44CKLZA/ 
 
https://gitee.com/src-openeuler/kernel/issues/I9T5PA 
 
Link:https://gitee.com/openeuler/kernel/pulls/9407

 

Reviewed-by: Ye Weihua <yeweihua4@huawei.com>
Reviewed-by: Liu YongQiang <liuyongqiang13@huawei.com>
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>