rt2800usb: fix rt2800usb_rfcsr_read()

The driver should write the read request into RF_CSR_CFG register
and not BBP_CSR_CFG one in rt2800usb_rfcsr_read().

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Acked-by: Ivo van Doorn <IvDoorn@gmail.com>
Acked-by: Gertjan van Wingerde <gwingerde@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rt2x00/rt2800usb.c

@@ -167,7 +167,7 @@ static void rt2800usb_rfcsr_read(struct rt2x00_dev *rt2x00dev,
 		rt2x00_set_field32(&reg, RF_CSR_CFG_WRITE, 0);
 		rt2x00_set_field32(&reg, RF_CSR_CFG_BUSY, 1);
 
-		rt2x00usb_register_write_lock(rt2x00dev, BBP_CSR_CFG, reg);
+		rt2x00usb_register_write_lock(rt2x00dev, RF_CSR_CFG, reg);
 
 		WAIT_FOR_RFCSR(rt2x00dev, &reg);
 	}