rt2x00: Fix rate initialization

Fix typo in rate initialization. This fixes the WARN_ON()
in net/wireless/util.cpp:83
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rt2x00/rt2x00dev.c

@@ -876,7 +876,7 @@ static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
 	 * Initialize Rate list.
 	 */
 	for (i = 0; i < spec->num_rates; i++)
-		rt2x00lib_rate(&rates[0], i, rt2x00_get_rate(i));
+		rt2x00lib_rate(&rates[i], i, rt2x00_get_rate(i));
 
 	/*
 	 * Initialize Channel list.