USB: convert drivers/input/* to use module_usb_driver()

This converts the drivers in drivers/input/* to use the
module_usb_driver() macro which makes the code smaller and a bit
simpler.

Added bonus is that it removes some unneeded kernel log messages about
drivers loading and/or unloading.

Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: Ville Syrjala <syrjala@sci.fi>
Cc: Henk Vergonet <Henk.Vergonet@gmail.com>
Cc: Alessandro Rubini <rubini@ipvvis.unipv.it>
Cc: Henrik Rydberg <rydberg@euromail.se>
Cc: "Magnus Hörlin" <magnus@alefors.se>
Cc: Chris Moeller <kode54@gmail.c>
Cc: Christoph Fritz <chf.fritz@googlemail.com>
Cc: Lucas De Marchi <lucas.demarchi@profusion.mobi>
Cc: Jesper Juhl <jj@chaosbits.net>
Cc: Edwin van Vliet <edwin@cheatah.nl>
Cc: Ping Cheng <pingc@wacom.com>
Cc: Eduard Hasenleithner <eduard@hasenleithner.at>
Cc: Alexander Strakh <strakh@ispras.ru>
Cc: Glenn Sommer <gsommer@datanordisk.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/input/tablet/gtco.c b/drivers/input/tablet/gtco.c
index 8ea6afe..89a2978 100644
--- a/drivers/input/tablet/gtco.c
+++ b/drivers/input/tablet/gtco.c
@@ -1022,33 +1022,7 @@
 	.disconnect	= gtco_disconnect,
 };
 
-/*
- *  Register this module with the USB subsystem
- */
-static int __init gtco_init(void)
-{
-	int error;
-
-	error = usb_register(&gtco_driverinfo_table);
-	if (error) {
-		err("usb_register() failed rc=0x%x", error);
-		return error;
-	}
-
-	printk("GTCO usb driver version: %s", GTCO_VERSION);
-	return 0;
-}
-
-/*
- *   Deregister this module with the USB subsystem
- */
-static void __exit gtco_exit(void)
-{
-	usb_deregister(&gtco_driverinfo_table);
-}
-
-module_init(gtco_init);
-module_exit(gtco_exit);
+module_usb_driver(gtco_driverinfo_table);
 
 MODULE_DESCRIPTION("GTCO digitizer USB driver");
 MODULE_LICENSE("GPL");