drm/amd/display: Fix potential nullptr error

[ Upstream commit 4f7129112c ]

[Why]
Fix surface/plane potential nullptr

[How]
add null check

Signed-off-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Reviewed-by: Aric Cyr <Aric.Cyr@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Bhawanpreet Lakha 2018-10-09 13:47:34 -04:00 • committed by Greg Kroah-Hartman
commit d972ff1f70