[NET]: Introduce and use print_mac() and DECLARE_MAC_BUF()

This is nicer than the MAC_FMT stuff.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/rionet.c b/drivers/net/rionet.c
index d43dcf3..e7fd08a 100644
--- a/drivers/net/rionet.c
+++ b/drivers/net/rionet.c
@@ -432,6 +432,7 @@
 	struct net_device *ndev = NULL;
 	struct rionet_private *rnet;
 	u16 device_id;
+	DECLARE_MAC_BUF(mac);
 
 	/* Allocate our net_device structure */
 	ndev = alloc_etherdev(sizeof(struct rionet_private));
@@ -472,13 +473,12 @@
 	if (rc != 0)
 		goto out;
 
-	printk("%s: %s %s Version %s, MAC %02x:%02x:%02x:%02x:%02x:%02x\n",
+	printk("%s: %s %s Version %s, MAC %s\n",
 	       ndev->name,
 	       DRV_NAME,
 	       DRV_DESC,
 	       DRV_VERSION,
-	       ndev->dev_addr[0], ndev->dev_addr[1], ndev->dev_addr[2],
-	       ndev->dev_addr[3], ndev->dev_addr[4], ndev->dev_addr[5]);
+	       print_mac(mac, ndev->dev_addr));
 
       out:
 	return rc;