drm: mali-dp: potential dereference of null pointer

mainline inclusion
from mainline-v5.19-rc1
commit 73c3ed74
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/I6698V


CVE: CVE-2022-3115

--------------------------------

The return value of kzalloc() needs to be checked.
To avoid use of null pointer '&state->base' in case of the
failure of alloc.

Fixes: 99665d07 ("drm: mali-dp: add malidp_crtc_state struct")
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Reviewed-by: Brian Starkey <brian.starkey@arm.com>
Signed-off-by: Liviu Dudau <liviu.dudau@arm.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211214100837.46912-1-jiasheng@iscas.ac.cn



Conflicts:
	drivers/gpu/drm/arm/malidp_crtc.c

Signed-off-by: ChenXiaoSong <chenxiaosong2@huawei.com>
Reviewed-by: Zhang Xiaoxu <zhangxiaoxu5@huawei.com>
Reviewed-by: Xiu Jianfeng <xiujianfeng@huawei.com>
Signed-off-by: Yongqiang Liu <liuyongqiang13@huawei.com>