rtlwifi: rtl8192cu: Fix false loss of AP indication

A major change in the rtlwifi family recently added code to detect when
there is loss of AP signals. One critical statement needed for the USB
driver was missed.
Signed-off-by: NLarry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rtlwifi/usb.c

@@ -521,6 +521,9 @@ static void _rtl_usb_rx_process_noagg(struct ieee80211_hw *hw,
 				rtlpriv->link_info.num_rx_inperiod++;
 		}
 
+		/* static bcn for roaming */
+		rtl_beacon_statistic(hw, skb);
+
 		if (likely(rtl_action_proc(hw, skb, false)))
 			ieee80211_rx(hw, skb);
 		else