HID: multitouch: make sure the static list of class is not changed

const is a magic keyword here :)
Acked-by: Peter Hutterer <peter.hutterer@who-t.net>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/hid/hid-multitouch.c

@@ -211,7 +211,7 @@ static int cypress_compute_slot(struct mt_device *td)
 		return -1;
 }
 
-static struct mt_class mt_classes[] = {
+static const struct mt_class mt_classes[] = {
 	{ .name = MT_CLS_DEFAULT,
 		.quirks = MT_QUIRK_ALWAYS_VALID |
 			MT_QUIRK_CONTACT_CNT_ACCURATE },
@@ -1432,7 +1432,7 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
 {
 	int ret, i;
 	struct mt_device *td;
-	struct mt_class *mtclass = mt_classes; /* MT_CLS_DEFAULT */
+	const struct mt_class *mtclass = mt_classes; /* MT_CLS_DEFAULT */
 
 	for (i = 0; mt_classes[i].name ; i++) {
 		if (id->driver_data == mt_classes[i].name) {