[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/net/mac80211/debugfs_key.c b/net/mac80211/debugfs_key.c
index 8e4a1bc..c881524 100644
--- a/net/mac80211/debugfs_key.c
+++ b/net/mac80211/debugfs_key.c
@@ -262,11 +262,12 @@
 				    struct sta_info *sta)
 {
 	char buf[50];
+	DECLARE_MAC_BUF(mac);
 
 	if (!key->debugfs.dir)
 		return;
 
-	sprintf(buf, "../../stations/" MAC_FMT, MAC_ARG(sta->addr));
+	sprintf(buf, "../../stations/%s", print_mac(mac, sta->addr));
 	key->debugfs.stalink =
 		debugfs_create_symlink("station", key->debugfs.dir, buf);
 }