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/drivers/pcap_kern.c b/arch/um/drivers/pcap_kern.c
index 3a750dd..2860525 100644
--- a/arch/um/drivers/pcap_kern.c
+++ b/arch/um/drivers/pcap_kern.c
@@ -21,7 +21,7 @@
 	struct pcap_data *ppri;
 	struct pcap_init *init = data;
 
-	pri = dev->priv;
+	pri = netdev_priv(dev);
 	ppri = (struct pcap_data *) pri->user;
 	ppri->host_if = init->host_if;
 	ppri->promisc = init->promisc;