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

To accomplish this the function to register a gadget driver takes the bind
function as a second argument.  To make things clearer rename the function
to resemble platform_driver_probe.

This fixes many section mismatches like

	WARNING: drivers/usb/gadget/g_printer.o(.data+0xc): Section mismatch in
	reference from the variable printer_driver to the function
	.init.text:printer_bind()
	The variable printer_driver references
	the function __init printer_bind()

All callers are fixed.

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

diff --git a/drivers/usb/gadget/at91_udc.c b/drivers/usb/gadget/at91_udc.c
index 93ead19..387e503 100644
--- a/drivers/usb/gadget/at91_udc.c
+++ b/drivers/usb/gadget/at91_udc.c
@@ -1628,7 +1628,8 @@
 		schedule_work(&udc->vbus_timer_work);
 }
 
-int usb_gadget_register_driver (struct usb_gadget_driver *driver)
+int usb_gadget_probe_driver(struct usb_gadget_driver *driver,
+		int (*bind)(struct usb_gadget *))
 {
 	struct at91_udc	*udc = &controller;
 	int		retval;
@@ -1636,7 +1637,7 @@
 
 	if (!driver
 			|| driver->speed < USB_SPEED_FULL
-			|| !driver->bind
+			|| !bind
 			|| !driver->setup) {
 		DBG("bad parameter.\n");
 		return -EINVAL;
@@ -1653,9 +1654,9 @@
 	udc->enabled = 1;
 	udc->selfpowered = 1;
 
-	retval = driver->bind(&udc->gadget);
+	retval = bind(&udc->gadget);
 	if (retval) {
-		DBG("driver->bind() returned %d\n", retval);
+		DBG("bind() returned %d\n", retval);
 		udc->driver = NULL;
 		udc->gadget.dev.driver = NULL;
 		dev_set_drvdata(&udc->gadget.dev, NULL);
@@ -1671,7 +1672,7 @@
 	DBG("bound to %s\n", driver->driver.name);
 	return 0;
 }
-EXPORT_SYMBOL (usb_gadget_register_driver);
+EXPORT_SYMBOL(usb_gadget_probe_driver);
 
 int usb_gadget_unregister_driver (struct usb_gadget_driver *driver)
 {