[PATCH] USB: changed the interface name to be a bit more unique.

This is needed as long as we have the directory of symlinks in the bus
subdir in driverfs to point to the unique interfaces.

drivers/usb/core/usb.c

@@ -947,7 +947,8 @@ static void usb_find_drivers(struct usb_device *dev)
 		/* register this interface with driverfs */
 		interface->dev.parent = &dev->dev;
 		interface->dev.bus = &usb_bus_type;
-		sprintf (&interface->dev.bus_id[0], "if%d",
+		sprintf (&interface->dev.bus_id[0], "%s:%d",
+			 dev->devpath,
 			 interface->altsetting->bInterfaceNumber);
 		if (!desc->iInterface
 				|| usb_string (dev, desc->iInterface,