rt2x00: Filter ACK_CTS based on FIF_CONTROL

The ACK_CTS frame is a control frame, this means
dropping the frame depends on the FIF_CONTROL flag
for filtering.

This also fixes an obvious typo in register definition.

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/rt2x00/rt73usb.c b/drivers/net/wireless/rt2x00/rt73usb.c
index afd8533..c3d4e93 100644
--- a/drivers/net/wireless/rt2x00/rt73usb.c
+++ b/drivers/net/wireless/rt2x00/rt73usb.c
@@ -1929,7 +1929,8 @@
 	rt2x00_set_field32(&reg, TXRX_CSR0_DROP_MULTICAST,
 			   !(*total_flags & FIF_ALLMULTI));
 	rt2x00_set_field32(&reg, TXRX_CSR0_DROP_BROADCAST, 0);
-	rt2x00_set_field32(&reg, TXRX_CSR0_DROP_ACK_CTS, 1);
+	rt2x00_set_field32(&reg, TXRX_CSR0_DROP_ACK_CTS,
+			   !(*total_flags & FIF_CONTROL));
 	rt73usb_register_write(rt2x00dev, TXRX_CSR0, reg);
 }