ARM: OMAP: Remove warning in tlv320aic23.c

Remove warning in tlv320aic23.c about unused variable
Signed-off-by: Dirk Behme <dirk.behme@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

drivers/i2c/chips/tlv320aic23.c

@@ -652,8 +652,6 @@ static int __init aic23_init(void)
 
 static void __exit aic23_exit(void)
 {
-	int res;
-
 	aic23_power_down();
 	i2c_del_driver(&aic23_driver);