mac80211: Fix STA disconnect due to MIC failure

Th commit titled "mac80211: clean up rx handling wrt. found_sta"
removed found_sta variable which caused a MIC failure event
to be reported twice for a single failure to supplicant resulted
in STA disconnect.

This should fix WPA specific countermeasures WiFi test case (5.2.17)
issues with mac80211 based drivers which report MIC failure events in
rx status.

Cc: Stable <stable@kernel.org> (2.6.37)
Signed-off-by: Senthil Balasubramanian <senthilkumar@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

net/mac80211/rx.c

@@ -2745,6 +2745,7 @@ static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
 
 			if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
 				return;
+			goto out;
 		}
 	}
 
@@ -2784,6 +2785,7 @@ static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
 			return;
 	}
 
+ out:
 	dev_kfree_skb(skb);
 }