drm: amd: display: Fix memory leakage

stable inclusion
from stable-v5.10.173
commit d473c55ce1975c9e601c25293328a5039225d2b2
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8BFR3

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=d473c55ce1975c9e601c25293328a5039225d2b2



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

[ Upstream commit 6b8701be ]

This commit fixes memory leakage in dc_construct_ctx() function.

Signed-off-by: Konstantin Meskhidze <konstantin.meskhidze@huawei.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: sanglipeng <sanglipeng1@jd.com>