ath9k: remove unused base_index from rate table.

base index is not used anymore and so remove it.
Signed-off-by: NSenthil Balasubramanian <senthilkumar@atheros.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath9k/rc.h

@@ -162,7 +162,6 @@ struct ath_rate_table {
 		u8 ratecode;
 		u8 dot11rate;
 		u8 ctrl_rate;
-		u8 base_index;
 		u8 cw40index;
 		u8 sgi_index;
 		u8 ht_index;