mac80211: Support multiple VIFS per AP in debugfs.

Create 'stations' sub-directory under each netdev:[vif-name]
directory to hold all stations for that network device.

Signed-off-by: Ben Greear <greearb@candelatech.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/debugfs_sta.c b/net/mac80211/debugfs_sta.c
index 76839d4..6b7ff9f 100644
--- a/net/mac80211/debugfs_sta.c
+++ b/net/mac80211/debugfs_sta.c
@@ -300,7 +300,7 @@
 
 void ieee80211_sta_debugfs_add(struct sta_info *sta)
 {
-	struct dentry *stations_dir = sta->local->debugfs.stations;
+	struct dentry *stations_dir = sta->sdata->debugfs.subdir_stations;
 	u8 mac[3*ETH_ALEN];
 
 	sta->debugfs.add_has_run = true;