Staging: vt6656: Make a read-only structure

This patch add const qualifier at the declaration of the structure.
The structure become a read-only data, this increase the security.

Signed-off-by: Mihaela Muraru <mihaela.muraru21@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vt6656/main_usb.c

@@ -85,7 +85,7 @@ MODULE_PARM_DESC(tx_buffers, "Number of receive usb tx buffers");
  * Static vars definitions
  */
 
-static struct usb_device_id vt6656_table[] = {
+static const struct usb_device_id vt6656_table[] = {
 	{USB_DEVICE(VNT_USB_VENDOR_ID, VNT_USB_PRODUCT_ID)},
 	{}
 };