networkd: correctly handle manager_free(NULL)
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@ -98,6 +98,9 @@ void manager_free(Manager *m) {
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NetDev *netdev;
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Link *link;
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if (!m)
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return;
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udev_monitor_unref(m->udev_monitor);
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udev_unref(m->udev);
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sd_bus_unref(m->bus);
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