um: Kill directly reference of netdev->priv

Simply replace netdev->priv with netdev_priv().

Signed-off-by: Wang Chen <wangchen@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/um/os-Linux/drivers/ethertap_kern.c b/arch/um/os-Linux/drivers/ethertap_kern.c
index 046a131..7f6f9a7 100644
--- a/arch/um/os-Linux/drivers/ethertap_kern.c
+++ b/arch/um/os-Linux/drivers/ethertap_kern.c
@@ -22,7 +22,7 @@
 	struct ethertap_data *epri;
 	struct ethertap_init *init = data;
 
-	pri = dev->priv;
+	pri = netdev_priv(dev);
 	epri = (struct ethertap_data *) pri->user;
 	epri->dev_name = init->dev_name;
 	epri->gate_addr = init->gate_addr;