!1291 [sync] PR-1262: drm/msm/dpu: Add check for pstates

Merge Pull Request from: @openeuler-sync-bot 
 

Origin pull request: 
https://gitee.com/openeuler/kernel/pulls/1262 
 
PR sync from: Xia Fukun <xiafukun@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/LCJWGRWDEBQ2SDVR5JOAP447NA4IDPK4/ 
 
 
Link:https://gitee.com/openeuler/kernel/pulls/1291 

Reviewed-by: Zucheng Zheng <zhengzucheng@huawei.com> 
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com> 

drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c

@@ -831,6 +831,8 @@ static int dpu_crtc_atomic_check(struct drm_crtc *crtc,
 	struct drm_rect crtc_rect = { 0 };
 
 	pstates = kzalloc(sizeof(*pstates) * DPU_STAGE_MAX * 4, GFP_KERNEL);
+	if (!pstates)
+		return -ENOMEM;
 
 	if (!state->enable || !state->active) {
 		DPU_DEBUG("crtc%d -> enable %d, active %d, skip atomic_check\n",