USB: serial: drop unused core USB driver

Drop the usb-serial-core USB driver that was registered at module init
but then never used.

This was a remnant dating back to 2004 (!) when this struct usb_driver
was used for the generic driver; see commit bbc53b7d ("USB: fix bug
where removing usb-serial modules or usb serial devices could oops") in
the tglx bitkeeper-history archive.

Note that every usb-serial driver (including the generic one) registers
its own USB (interface) driver along with its usb-serial bus drivers.
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Johan Hovold <johan@kernel.org>

drivers/usb/serial/usb-serial.c

@@ -1201,17 +1201,6 @@ static const struct tty_operations serial_ops = {
 
 struct tty_driver *usb_serial_tty_driver;
 
-/* Driver structure we register with the USB core */
-static struct usb_driver usb_serial_driver = {
-	.name =		"usbserial",
-	.probe =	usb_serial_probe,
-	.disconnect =	usb_serial_disconnect,
-	.suspend =	usb_serial_suspend,
-	.resume =	usb_serial_resume,
-	.no_dynamic_id =	1,
-	.supports_autosuspend =	1,
-};
-
 static int __init usb_serial_init(void)
 {
 	int result;
@@ -1247,13 +1236,6 @@ static int __init usb_serial_init(void)
 		goto exit_reg_driver;
 	}
 
-	/* register the USB driver */
-	result = usb_register(&usb_serial_driver);
-	if (result < 0) {
-		pr_err("%s - usb_register failed\n", __func__);
-		goto exit_tty;
-	}
-
 	/* register the generic driver, if we should */
 	result = usb_serial_generic_register();
 	if (result < 0) {
@@ -1264,9 +1246,6 @@ static int __init usb_serial_init(void)
 	return result;
 
 exit_generic:
-	usb_deregister(&usb_serial_driver);
-
-exit_tty:
 	tty_unregister_driver(usb_serial_tty_driver);
 
 exit_reg_driver:
@@ -1285,7 +1264,6 @@ static void __exit usb_serial_exit(void)
 
 	usb_serial_generic_deregister();
 
-	usb_deregister(&usb_serial_driver);
 	tty_unregister_driver(usb_serial_tty_driver);
 	put_tty_driver(usb_serial_tty_driver);
 	bus_unregister(&usb_serial_bus_type);