mac80211: remove unused SSID from BSS

The ssid/ssid_len fields in the private BSS
struct are unused, contrary to the comment
we do look up the SSID in the few cases we
need it.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/ieee80211_i.h

@@ -86,10 +86,6 @@ struct ieee80211_fragment_entry {
 
 
 struct ieee80211_bss {
-	/* don't want to look up all the time */
-	size_t ssid_len;
-	u8 ssid[IEEE80211_MAX_SSID_LEN];
-
 	u32 device_ts;
 
 	bool wmm_used;