rt2x00: rt2800lib: no need to write RF register 3 twice for RT5592

In rt2800_init_rfcsr_5592(), there's no need to write RF register 3 twice.
Signed-off-by: Kevin Lo <kevlo@kevlo.org>
Acked-by: Gertjan van Wingerde <gwingerde@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rt2x00/rt2800lib.c

@@ -6610,7 +6610,6 @@ static void rt2800_init_rfcsr_5592(struct rt2x00_dev *rt2x00dev)
 
 	rt2800_rfcsr_write(rt2x00dev, 1, 0x3F);
 	rt2800_rfcsr_write(rt2x00dev, 3, 0x08);
-	rt2800_rfcsr_write(rt2x00dev, 3, 0x08);
 	rt2800_rfcsr_write(rt2x00dev, 5, 0x10);
 	rt2800_rfcsr_write(rt2x00dev, 6, 0xE4);
 	rt2800_rfcsr_write(rt2x00dev, 7, 0x00);