drm/tegra: dsi: Add missing check for of_find_device_by_node

stable inclusion
from stable-v5.10.214
commit 92003981a6df5dc84af8a5904f8ee112fa324129
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9L9OA
CVE: CVE-2023-52650

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=92003981a6df5dc84af8a5904f8ee112fa324129



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[ Upstream commit afe6fcb9775882230cd29b529203eabd5d2a638d ]

Add check for the return value of of_find_device_by_node() and return
the error if it fails in order to avoid NULL pointer dereference.

Fixes: e94236cd ("drm/tegra: dsi: Add ganged mode support")
Signed-off-by: Chen Ni <nichen@iscas.ac.cn>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231024080738.825553-1-nichen@iscas.ac.cn


Signed-off-by: Sasha Levin <sashal@kernel.org>
conflict:
        drivers/gpu/drm/tegra/dsi.c
Signed-off-by: Yuntao Liu <liuyuntao12@huawei.com>