cfg80211: put wext data into substructure

To make it more apparent in the code what is for wext
only (and needs to be #ifdef'ed) put all the info for
wext into a substruct in each wireless_dev.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/wireless/core.c b/net/wireless/core.c
index 2006a4e..15b2a179 100644
--- a/net/wireless/core.c
+++ b/net/wireless/core.c
@@ -470,9 +470,9 @@
 #ifdef CONFIG_WIRELESS_EXT
 		if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_ADHOC)
 			break;
-		if (!dev->ieee80211_ptr->wext.ssid_len)
+		if (!dev->ieee80211_ptr->wext.ibss.ssid_len)
 			break;
-		cfg80211_join_ibss(rdev, dev, &dev->ieee80211_ptr->wext);
+		cfg80211_join_ibss(rdev, dev, &dev->ieee80211_ptr->wext.ibss);
 		break;
 #endif
 	case NETDEV_UNREGISTER: