drm/amd/display: Clean up some inconsistent indenting

[ Upstream commit 1da2fcc4 ]

Eliminate the follow smatch warning:

drivers/gpu/drm/amd/amdgpu/../display/dmub/src/dmub_srv.c:622
dmub_srv_cmd_execute() warn: inconsistent indenting.

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Stable-dep-of: 892b41b1 ("drm/amd/display: Fix incorrect DSC instance for MST")
Signed-off-by: Sasha Levin <sashal@kernel.org>