mac80211: Fix ibss station got expired immediately

Station addition in ieee80211_ibss_rx_queued_mgmt is not updating
sta->last_rx which is causing station expiry in ieee80211_ibss_work
path. So sta addition and deletion happens repeatedly.

CC: stable@kernel.org
Signed-off-by: NRajkumar Manoharan <rmanoharan@atheros.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

net/mac80211/ibss.c

@@ -456,6 +456,7 @@ struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
 	if (!sta)
 		return NULL;
 
+	sta->last_rx = jiffies;
 	set_sta_flags(sta, WLAN_STA_AUTHORIZED);
 
 	/* make sure mandatory rates are always added */