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/lifebook.c b/drivers/input/mouse/lifebook.c
index c14395ba..5e9d250 100644
--- a/drivers/input/mouse/lifebook.c
+++ b/drivers/input/mouse/lifebook.c
@@ -115,13 +115,15 @@
 
 static void lifebook_set_resolution(struct psmouse *psmouse, unsigned int resolution)
 {
-	unsigned char params[] = { 0, 1, 2, 2, 3 };
+	static const unsigned char params[] = { 0, 1, 2, 2, 3 };
+	unsigned char p;
 
 	if (resolution == 0 || resolution > 400)
 		resolution = 400;
 
-	ps2_command(&psmouse->ps2dev, &params[resolution / 100], PSMOUSE_CMD_SETRES);
-	psmouse->resolution = 50 << params[resolution / 100];
+	p = params[resolution / 100];
+	ps2_command(&psmouse->ps2dev, &p, PSMOUSE_CMD_SETRES);
+	psmouse->resolution = 50 << p;
 }
 
 static void lifebook_disconnect(struct psmouse *psmouse)