gdk_device_list_slave_devices (GdkDevice *device)
{
g_return_val_if_fail (GDK_IS_DEVICE (device), NULL);
- g_return_val_if_fail (gdk_device_get_device_type (device) != GDK_DEVICE_TYPE_MASTER, NULL);
+ g_return_val_if_fail (gdk_device_get_device_type (device) == GDK_DEVICE_TYPE_MASTER, NULL);
return g_list_copy (device->slaves);
}