mac80211: fix key debugfs default_key link

The default_key symlink points to the key index rather than
they key counter, fix it.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/key.h b/net/mac80211/key.h
index 467890c..5d48518 100644
--- a/net/mac80211/key.h
+++ b/net/mac80211/key.h
@@ -125,6 +125,7 @@
 		struct dentry *replays;
 		struct dentry *key;
 		struct dentry *ifindex;
+		int cnt;
 	} debugfs;
 #endif