usb gadget: don't save bind callback in struct usb_composite_driver

The bind function is most of the time only called at init time so there
is no need to save a pointer to it in the composite driver structure.

This fixes many section mismatches reported by modpost.

Signed-off-by: Michał Nazarewicz <m.nazarewicz@samsung.com>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/gadget/audio.c

@@ -166,13 +166,12 @@ static struct usb_composite_driver audio_driver = {
 	.name		= "g_audio",
 	.dev		= &device_desc,
 	.strings	= audio_strings,
-	.bind		= audio_bind,
 	.unbind		= __exit_p(audio_unbind),
 };
 
 static int __init init(void)
 {
-	return usb_composite_register(&audio_driver);
+	return usb_composite_probe(&audio_driver, audio_bind);
 }
 module_init(init);