pfctl: Do not warn if there is no Ethernet anchor

[jlduran]

Summary

Avoid emitting a warning if there is no Ethernet anchor. If the anchor
--regardless of its type-- is nonexistent, should be caught earlier.

PR: 280516

[jlduran]

This is the simplest fix I can think of to fix PR 280516.
Feel free to commandeer, this or the parent revision. My main objective is to ship blocklist without defects or misleading warnings.

sbin/pfctl/pfctl.c

1240

I think this warning is also not needed. However, I don't know how to test this code path.

1577

I think this warning is also not needed. However, I don't know how to test this code path.

[kp]

Thanks. I’ll try to review this (and your other patch) in the next days.

[kp]

Part of the issue here is that we've got layer 3 and ethernet anchors and it's possible for an anchor to exist in one but not the other. So a pfctl -sA -a foo can be valid for one but not the other. I don't immediately see a better way of handling that than to just not raise errors either.