mac80211: convert to %pM away from print_mac

Also remove a few stray DECLARE_MAC_BUF that were no longer
used at all.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/mac80211/debugfs_netdev.c b/net/mac80211/debugfs_netdev.c
index 2ad504f..69b2fbf 100644
--- a/net/mac80211/debugfs_netdev.c
+++ b/net/mac80211/debugfs_netdev.c
@@ -104,8 +104,7 @@
 	const struct ieee80211_sub_if_data *sdata, char *buf,		\
 	int buflen)							\
 {									\
-	DECLARE_MAC_BUF(mac);						\
-	return scnprintf(buf, buflen, "%s\n", print_mac(mac, sdata->field));\
+	return scnprintf(buf, buflen, "%pM\n", sdata->field);		\
 }
 
 #define __IEEE80211_IF_FILE(name)					\