drm/msm: Add missing put_task_struct() in debugfs path

stable inclusion
from stable-v5.10.112
commit cb66641f81060a5a5d88f85d2aeb73860edc79df
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5HL0X

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=cb66641f81060a5a5d88f85d2aeb73860edc79df



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[ Upstream commit ac3e4f42 ]

Fixes: 25faf2f2 ("drm/msm: Show process names in gem_describe")
Signed-off-by: Rob Clark <robdclark@chromium.org>
Link: https://lore.kernel.org/r/20220317184550.227991-1-robdclark@gmail.com


Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>
Acked-by: Xie XiuQi <xiexiuqi@huawei.com>