ath9k: Fix rssi update in ad-hoc mode

The average beacon rssi which will be used by ani is not updated
in adhoc mode.
Signed-off-by: Rajkumar Manoharan <rmanoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath9k/recv.c

@@ -917,7 +917,8 @@ static void ath9k_process_rssi(struct ath_common *common,
 	int last_rssi;
 	__le16 fc;
 
-	if (ah->opmode != NL80211_IFTYPE_STATION)
+	if ((ah->opmode != NL80211_IFTYPE_STATION) &&
+	    (ah->opmode != NL80211_IFTYPE_ADHOC))
 		return;
 
 	fc = hdr->frame_control;