USB: Gadget: Webcam: Return correct result of bind

The config bind was reported success even if usb_add_function
failed. Fix the return value.
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/gadget/f_uvc.c

@@ -651,7 +651,7 @@ uvc_bind_config(struct usb_configuration *c,
 	if (ret)
 		kfree(uvc);
 
-	return 0;
+	return ret;
 
 error:
 	kfree(uvc);