usb: gadget: printer: don't access file global usb_printer_gadget in function's code

The printer_dev can be recovered from printer_func_unbind() function's
parameters.

Signed-off-by: Andrzej Pietrasiewicz <[e-mail]>
Signed-off-by: Felipe Balbi <[e-mail]>

drivers/usb/gadget/legacy/printer.c

···
 	struct printer_dev	*dev;
 	struct usb_request	*req;
 
-	dev = &usb_printer_gadget;
+	dev = container_of(f, struct printer_dev, function);
 
 	device_destroy(usb_gadget_class, g_printer_devno);