Since ID_NET_NAME_SLOT was introduced we ignore slot == 0
https://github.com/systemd/systemd/blob/0035597a30d120f70df2dd7da3d6128fb8ba6051/src/udev/udev-builtin-net_id.c#L139
Qemu sets _SUN to PCI_SLOT() for all NICs, so _SUN is not unique.
https://gitlab.com/qemu-project/qemu/-/issues/2530
In my tests with libvirt I can only set 'slot="0x00"' in interface definition,
so all NICs end up with _SUN == 0, and this commit is enough to avoid the issue.
Fixes 0a4ecc54cb
System and Service Manager
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