drm/msm: Fix potential invalid ptr free

stable inclusion
from stable-v5.10.175
commit 08c0b54bef78eb74b9e1df32616fc85d5492c66f
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8711T

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=08c0b54bef78eb74b9e1df32616fc85d5492c66f



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[ Upstream commit 8a86f213 ]

The error path cleanup expects that chain and syncobj are either NULL or
valid pointers.  But post_deps was not allocated with __GFP_ZERO.

Fixes: ab723b7a ("drm/msm: Add syncobj support.")
Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Patchwork: https://patchwork.freedesktop.org/patch/523051/
Link: https://lore.kernel.org/r/20230215235048.1166484-1-robdclark@gmail.com


Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: sanglipeng <sanglipeng1@jd.com>