drm/amdgpu: tear down ttm range manager for doorbell in amdgpu_ttm_fi…

…ni()

Tear down ttm range manager for doorbell in function amdgpu_ttm_fini(),
to avoid memory leakage.

Fixes: 792b84f ("drm/amdgpu: initialize ttm for doorbells")
Signed-off-by: Jiang Liu <gerry@linux.alibaba.com>
Signed-off-by: Kent Russell <kent.russell@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c

@@ -2066,6 +2066,7 @@ void amdgpu_ttm_fini(struct amdgpu_device *adev)
 	ttm_range_man_fini(&adev->mman.bdev, AMDGPU_PL_GDS);
 	ttm_range_man_fini(&adev->mman.bdev, AMDGPU_PL_GWS);
 	ttm_range_man_fini(&adev->mman.bdev, AMDGPU_PL_OA);
+	ttm_range_man_fini(&adev->mman.bdev, AMDGPU_PL_DOORBELL);
 	ttm_device_fini(&adev->mman.bdev);
 	adev->mman.initialized = false;
 	DRM_INFO("amdgpu: ttm finalized\n");