incusd/device/nic/bridged: Handle invalid configuration #2856

Job	Run time
Documentation	5m 4s
Code (oldstable)	7m 43s
System (stable, cluster, dir)	12m 2s
Code (stable)	7m 30s
Client (oldstable, ubuntu-latest)	58s
System (stable, cluster, btrfs)	11m 53s
Code (tip)	10m 29s
Client (oldstable, macos-latest)	55s
System (stable, cluster, lvm)	12m 46s
Client (oldstable, windows-latest)	2m 42s
System (stable, cluster, zfs)	13m 28s
Client (stable, ubuntu-latest)	1m 3s
System (stable, cluster, ceph)	16m 5s
Client (stable, macos-latest)	58s
System (stable, cluster, random)	11m 39s
Client (stable, windows-latest)	1m 25s
System (stable, standalone, dir)	22m 24s
System (stable, standalone, btrfs)	22m 25s
System (stable, standalone, lvm)	39m 33s
System (stable, standalone, zfs)	38m 34s
System (stable, standalone, ceph)	1h 16m 42s
System (stable, standalone, random)	35m 57s
System (oldstable, cluster, dir)	11m 36s
System (oldstable, standalone, dir)	23m 13s
System (tip, cluster, dir)	14m 25s
System (tip, standalone, dir)	25m 18s
	7h 6m 47s

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