rt2x00: rt2800usb: use correct [RT]XWI size for RT3593

The RT3593 chipset requires different [RT]XWI size
values. Modify the driver to use the correct values.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Acked-by: Stanislaw Gruszka <stf_xl@wp.pl>
Acked-by: Gertjan van Wingerde <gwingerde@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/rt2x00/rt2800usb.c b/drivers/net/wireless/rt2x00/rt2800usb.c
index 840833b..c24c1fd 100644
--- a/drivers/net/wireless/rt2x00/rt2800usb.c
+++ b/drivers/net/wireless/rt2x00/rt2800usb.c
@@ -854,7 +854,10 @@
 	struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
 	unsigned short txwi_size, rxwi_size;
 
-	if (rt2x00_rt(rt2x00dev, RT5592)) {
+	if (rt2x00_rt(rt2x00dev, RT3593)) {
+		txwi_size = TXWI_DESC_SIZE_4WORDS;
+		rxwi_size = RXWI_DESC_SIZE_5WORDS;
+	} else if (rt2x00_rt(rt2x00dev, RT5592)) {
 		txwi_size = TXWI_DESC_SIZE_5WORDS;
 		rxwi_size = RXWI_DESC_SIZE_6WORDS;
 	} else {