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drm/amdgpu/display: drop unused function

This is not longer used as of the latest rework of this
code so drop it to avoid a unused function warning.

Acked-by: Nirmoy Das <nirmoy.das@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

-18
-18
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
··· 2827 2827 return NULL; 2828 2828 } 2829 2829 2830 - static struct dm_atomic_state * 2831 - dm_atomic_get_old_state(struct drm_atomic_state *state) 2832 - { 2833 - struct drm_device *dev = state->dev; 2834 - struct amdgpu_device *adev = dev->dev_private; 2835 - struct amdgpu_display_manager *dm = &adev->dm; 2836 - struct drm_private_obj *obj; 2837 - struct drm_private_state *old_obj_state; 2838 - int i; 2839 - 2840 - for_each_old_private_obj_in_state(state, obj, old_obj_state, i) { 2841 - if (obj->funcs == dm->atomic_obj.funcs) 2842 - return to_dm_atomic_state(old_obj_state); 2843 - } 2844 - 2845 - return NULL; 2846 - } 2847 - 2848 2830 static struct drm_private_state * 2849 2831 dm_atomic_duplicate_state(struct drm_private_obj *obj) 2850 2832 {