ath9k: minor cleanup

Signed-off-by: Mohammed Shafi Shajakhan <mohammed@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

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

@@ -475,7 +475,6 @@ u32 ath_calcrxfilter(struct ath_softc *sc)
 
 	return rfilt;
 
-#undef RX_FILTER_PRESERVE
 }
 
 int ath_startrecv(struct ath_softc *sc)