rapidio: rio: fix possible name leak in rio_register_mport()

If device_register() returns error, the name allocated by dev_set_name()
need be freed. It should use put_device() to give up the reference in the
error path, so that the name can be freed in kobject_cleanup(), and
list_del() is called to delete the port from rio_mports.

Link: https://lkml.kernel.org/r/[e-mail]
Fixes: 2aaf308b95b2 ("rapidio: rework device hierarchy and introduce mport class of devices")
Signed-off-by: Yang Yingliang <[e-mail]>
Cc: Alexandre Bounine <[e-mail]>
Cc: Matt Porter <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>

drivers/rapidio/rio.c

···
 	atomic_set(&port->state, RIO_DEVICE_RUNNING);
 
 	res = device_register(&port->dev);
-	if (res)
+	if (res) {
 		dev_err(&port->dev, "RIO: mport%d registration failed ERR=%d\n",
 			port->id, res);
-	else
+		mutex_lock(&rio_mport_list_lock);
+		list_del(&port->node);
+		mutex_unlock(&rio_mport_list_lock);
+		put_device(&port->dev);
+	} else {
 		dev_dbg(&port->dev, "RIO: registered mport%d\n", port->id);
+	}
 
 	return res;
 }