Input: constify psmouse driver

Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
diff --git a/drivers/input/mouse/alps.h b/drivers/input/mouse/alps.h
index e428f8d..69db732 100644
--- a/drivers/input/mouse/alps.h
+++ b/drivers/input/mouse/alps.h
@@ -25,7 +25,7 @@
 	struct input_dev *dev2;		/* Relative device */
 	char name[32];			/* Name */
 	char phys[32];			/* Phys */
-	struct alps_model_info *i; 	/* Info */
+	const struct alps_model_info *i;/* Info */
 	int prev_fin;			/* Finger bit from previous packet */
 };