Input: make USB device ids constant

The id_table field of the struct usb_device_id is constant in <linux/usb.h>
so it makes sense to mark the initialization data also constant.

Signed-off-by: Márton Németh <nm127@freemail.hu>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
diff --git a/drivers/input/tablet/gtco.c b/drivers/input/tablet/gtco.c
index 3d32d3f..866a9ee 100644
--- a/drivers/input/tablet/gtco.c
+++ b/drivers/input/tablet/gtco.c
@@ -92,7 +92,7 @@
 /* DATA STRUCTURES */
 
 /* Device table */
-static struct usb_device_id gtco_usbid_table [] = {
+static const struct usb_device_id gtco_usbid_table[] = {
 	{ USB_DEVICE(VENDOR_ID_GTCO, PID_400) },
 	{ USB_DEVICE(VENDOR_ID_GTCO, PID_401) },
 	{ USB_DEVICE(VENDOR_ID_GTCO, PID_1000) },
diff --git a/drivers/input/touchscreen/usbtouchscreen.c b/drivers/input/touchscreen/usbtouchscreen.c
index 09a5e73..b1b99e9 100644
--- a/drivers/input/touchscreen/usbtouchscreen.c
+++ b/drivers/input/touchscreen/usbtouchscreen.c
@@ -144,7 +144,7 @@
 	.bInterfaceClass = USB_INTERFACE_CLASS_HID, \
 	.bInterfaceProtocol = USB_INTERFACE_PROTOCOL_MOUSE
 
-static struct usb_device_id usbtouch_devices[] = {
+static const struct usb_device_id usbtouch_devices[] = {
 #ifdef CONFIG_TOUCHSCREEN_USB_EGALAX
 	/* ignore the HID capable devices, handled by usbhid */
 	{USB_DEVICE_HID_CLASS(0x0eef, 0x0001), .driver_info = DEVTYPE_IGNORE},