dbb59dab73
When MACAddress= is unspecified, a stable MAC is generated to seed a newly created netdev. Since existing netdevs are reconfigured on reload/restart, this seed got re-applied to an already existing interface, conflicting with an explicit MACAddress= from the matching .network file and flipping MAC. Now, when MACAddress= is unspecified, only generate a new address if addr_assign_type is not NET_ADDR_SET (i.e. not already set by userspace). On first creation the interface does not exist yet, so this is a no-op and the address is generated as before. Mirrors src/udev/net/link-config.c. Fixes: #42457
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