usbnet: sierra: apply usbnet_link_change

Use usbnet_link_change to handle link change centrally.

Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/usb/sierra_net.c b/drivers/net/usb/sierra_net.c
index 79ab243..a923d61 100644
--- a/drivers/net/usb/sierra_net.c
+++ b/drivers/net/usb/sierra_net.c
@@ -413,11 +413,10 @@
 	if (link_up) {
 		sierra_net_set_ctx_index(priv, hh->msgspecific.byte);
 		priv->link_up = 1;
-		netif_carrier_on(dev->net);
 	} else {
 		priv->link_up = 0;
-		netif_carrier_off(dev->net);
 	}
+	usbnet_link_change(dev, link_up, 0);
 }
 
 static void sierra_net_dosync(struct usbnet *dev)