static struct usb_driver usbpn_driver;
-int usbpn_probe(struct usb_interface *intf, const struct usb_device_id *id)
+static int usbpn_probe(struct usb_interface *intf, const struct usb_device_id *id)
{
static const char ifname[] = "usbpn%d";
const struct usb_cdc_union_desc *union_header = NULL;