amdgpu/dc: fix indentation on a couple of returns.

These were misaligned.

found by the cocci ifcol script.
Signed-off-by: NDave Airlie <airlied@redhat.com>
Reviewed-by: NHarry Wentland <harry.wentland@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>