drm/amdgpu/display: return proper error codes in dm

Replace -1 with proper error codes.

Acked-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher 2018-09-13 11:01:28 -05:00
commit 59d0f396b5