Pick up upstream CAF patch for flow::from_steps

[Neverlord]

I've hit this recently with Zeek, so I've backported a CAF patch. After the broker::variant work, we should start following CAF releases again to receive patches like this automatically.

[awelzel]

It would be interesting to know if / how this would manifest in Zeek, but I guess we do not quite know?

Should this be backported included into the next 6.1/6.0 patch release?

[Neverlord]

It would be interesting to know if / how this would manifest in Zeek, but I guess we do not quite know?

If it manifests, it's a segfault (dereferencing a null pointer). Reproducing is tricky, though. Only happens for me with the variant branch, but I didn't dig into why it's not happening otherwise.

Should this be backported included into the next 6.1/6.0 patch release?

I suppose there's no reason not to. 🙂