usb: gadget: printer: call usb_add_function() last

Conversion to the new function interface requires splitting a
<something>_bind_config() function into two parts: allocation of
container_of struct usb_function and invocation of usb_add_function().
This patch moves the latter to the end of the f_printer_bind_config()
in order to enable conversion to the new interface.

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/gadget/legacy/printer.c

@@ -1254,11 +1254,6 @@ static int f_printer_bind_config(struct usb_configuration *c, char *pnp_str,
 	INIT_LIST_HEAD(&dev->rx_reqs);
 	INIT_LIST_HEAD(&dev->rx_buffers);
 
-	dev->q_len = q_len;
-	status = usb_add_function(c, &dev->function);
-	if (status)
-		return status;
-
 	if (pnp_str)
 		strlcpy(&pnp_string[2], pnp_str, sizeof(pnp_string) - 2);
 
@@ -1280,7 +1275,11 @@ static int f_printer_bind_config(struct usb_configuration *c, char *pnp_str,
 	dev->current_rx_req = NULL;
 	dev->current_rx_bytes = 0;
 	dev->current_rx_buf = NULL;
+	dev->q_len = q_len;
 
+	status = usb_add_function(c, &dev->function);
+	if (status)
+		return status;
 	INFO(dev, "%s, version: " DRIVER_VERSION "\n", driver_desc);
 	return 0;
 }