drm/amd/display: Fix recent checkpatch errors in amdgpu_dm

- Use tabs, not spaces.
- Brace and parentheses placement

Signed-off-by: Harry Wentland <[e-mail]>
Acked-by: Alex Deucher <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h

···
 	AMDGPU_TRANSFER_FUNCTION_GAMMA22_INV_EOTF,
 	AMDGPU_TRANSFER_FUNCTION_GAMMA24_INV_EOTF,
 	AMDGPU_TRANSFER_FUNCTION_GAMMA26_INV_EOTF,
-        AMDGPU_TRANSFER_FUNCTION_COUNT
+	AMDGPU_TRANSFER_FUNCTION_COUNT
 };
 
 struct dm_plane_state {
···
 
 	int abm_level;
 
-        /**
+	/**
 	 * @regamma_tf:
 	 *
 	 * Pre-defined transfer function for converting internal FB -> wire

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c

···
 static enum dc_transfer_func_predefined
 amdgpu_tf_to_dc_tf(enum amdgpu_transfer_function tf)
 {
-	switch (tf)
-	{
+	switch (tf) {
 	default:
 	case AMDGPU_TRANSFER_FUNCTION_DEFAULT:
 	case AMDGPU_TRANSFER_FUNCTION_IDENTITY:
···
 	 * plane and CRTC degamma at the same time. Explicitly reject atomic
 	 * updates when userspace sets both plane and CRTC degamma properties.
 	 */
-	if (has_crtc_cm_degamma && ret != -EINVAL){
+	if (has_crtc_cm_degamma && ret != -EINVAL) {
 		drm_dbg_kms(crtc->base.crtc->dev,
 			    "doesn't support plane and CRTC degamma at the same time\n");
 			return -EINVAL;

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crtc.c

···
 {
 	struct amdgpu_device *adev = drm_to_adev(crtc->dev);
 
-	if(adev->dm.dc->caps.color.mpc.ogam_ram)
+	if (adev->dm.dc->caps.color.mpc.ogam_ram)
 		drm_object_attach_property(&crtc->base,
 					   adev->mode_info.regamma_tf_property,
 					   AMDGPU_TRANSFER_FUNCTION_DEFAULT);