drm/amdkfd: Remove unnecessary condition in kfd_topology_add_device()

We re-arranged this code recently so "ret" is always zero at this point.
Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdkfd/kfd_topology.c

@@ -2012,10 +2012,9 @@ int kfd_topology_add_device(struct kfd_dev *gpu)
 
 	kfd_debug_print_topology();
 
-	if (!res)
 	kfd_notify_gpu_change(gpu_id, 1);
 
-	return res;
+	return 0;
 }
 
 /**