drm/amdgpu: correct the amdgpu runtime dereference usage count

stable inclusion
from stable-v5.10.205
commit d4fb20dcc13b37ee4f02025cd1dc8054d6027721
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8AS5P
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v5.10.205&id=d4fb20dcc13b37ee4f02025cd1dc8054d6027721



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[ Upstream commit c6df7f313794c3ad41a49b9a7c95da369db607f3 ]

Fix the amdgpu runpm dereference usage count.

Signed-off-by: Prike Liang <Prike.Liang@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Baogen Shang <baogen.shang@windriver.com>