drm/amdgpu: stop leaking page flip fence

reservation_object_get_fences_rcu already takes the references.

Signed-off-by: Christian König <[e-mail]>
Reviewed-by: Alex Deucher <[e-mail]>
Reviewed-by: Chunming Zhou <[e-mail]>
Reviewed-by: Jammy Zhou <[e-mail]>

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

···
 		goto cleanup;
 	}
 
-	fence_get(work->excl);
-	for (i = 0; i < work->shared_count; ++i)
-		fence_get(work->shared[i]);
-
 	amdgpu_bo_get_tiling_flags(new_rbo, &tiling_flags);
 	amdgpu_bo_unreserve(new_rbo);