virtio: console: remove_port() should return void

When a port is removed, we have to assume the port is gone. So a
success/failure return value doesn't make sense.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

drivers/char/virtio_console.c

@@ -1131,7 +1131,7 @@ static int add_port(struct ports_device *portdev, u32 id)
 }
 
 /* Remove all port-specific data. */
-static int remove_port(struct port *port)
+static void remove_port(struct port *port)
 {
 	struct port_buffer *buf;
 
@@ -1181,7 +1181,6 @@ static int remove_port(struct port *port)
 	debugfs_remove(port->debugfs_file);
 
 	kfree(port);
-	return 0;
 }
 
 /* Any private messages that the Host and Guest want to share */