[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/hp100.c b/drivers/net/hp100.c
index 406d652..e4fde17 100644
--- a/drivers/net/hp100.c
+++ b/drivers/net/hp100.c
@@ -2093,9 +2093,9 @@
 				addrs = dmi->dmi_addr;
 				if ((*addrs & 0x01) == 0x01) {	/* multicast address? */
 #ifdef HP100_DEBUG
-					printk("hp100: %s: multicast = %02x:%02x:%02x:%02x:%02x:%02x, ",
-						     dev->name, addrs[0], addrs[1], addrs[2],
-						     addrs[3], addrs[4], addrs[5]);
+					DECLARE_MAC_BUF(mac);
+					printk("hp100: %s: multicast = %s, ",
+						     dev->name, print_mac(mac, addrs));
 #endif
 					for (j = idx = 0; j < 6; j++) {
 						idx ^= *addrs++ & 0x3f;