drm/amdgpu: add missing breaks

Saves a few CPU cycles.

Reviewed-by: Chunming zhou <david1.zhou@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher 2016-06-23 11:48:30 -04:00
commit a225bf1c9c