Maisem Ali a917718353 util/linuxfw: return nil interface not concrete type
It was returning a nil `*iptablesRunner` instead of a
nil `NetfilterRunner` interface which would then fail
checks later.

Fixes #13012

Signed-off-by: Maisem Ali <maisem@tailscale.com>
2024-08-03 09:53:46 -07:00
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