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/include/net/cfg80211.h b/include/net/cfg80211.h
index 35afe97..4c74893 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1147,8 +1147,10 @@
 
 #ifdef CONFIG_WIRELESS_EXT
 	/* wext data */
-	struct cfg80211_ibss_params wext;
-	u8 wext_bssid[ETH_ALEN];
+	struct {
+		struct cfg80211_ibss_params ibss;
+		u8 bssid[ETH_ALEN];
+	} wext;
 #endif
 };