Input: elan_i2c - fix typo in include header guard

Signed-off-by: Nicolas Iooss <nicolas.iooss_linux@m4x.org>
Fixes: 6696777c6506 ("Input: add driver for Elan I2C/SMbus touchpad")
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/mouse/elan_i2c.h

@@ -17,7 +17,7 @@
  */
 
 #ifndef _ELAN_I2C_H
-#define _ELAN_i2C_H
+#define _ELAN_I2C_H
 
 #include <linux/types.h>