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veth: drop parent check during create_and_realize()

Fernando Fernández Mancera requested to merge ffmancera/network-manager-ff:ff/fix_veth_crash into main

When checking if the peer is already created there is no need to fetch the parent device. When fetching the parent device, if the system is slow, NetworkManager can hit a race condition where the property is still NULL.

Checking that the peer device exists and is type NM_DEVICE_TYPE_VETH is enough.

https://bugzilla.redhat.com/show_bug.cgi?id=2129829

Fixes: 4655b7c3 ('veth: fix veth activation on booting')

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