Before this patch, when a slave was registered for this first time
the following warning would display.
interface (null): enabled
This is because the slave was enabled before having its name
configured.
slave->aux = slave_;
slave->delay_expires = LLONG_MAX;
slave->up = bond_is_link_up(bond, netdev);
+ slave->name = xstrdup(netdev_get_name(netdev));
+
slave->enabled = false;
bond_enable_slave(slave, slave->up, NULL);
}