bin: Pass structs we plan to modify around by pointer, not value

bin: Pass structs we plan to modify around by pointer, not value

Otherwise the struct is going to be copied, which is not very efficient. And
also has the nice side effect that modifications of the struct might be
done in a copy, and we later use the original struct without the changes.

Caused LATENCY queries to always return the initialization values in one of my
tests, instead of the actual values reported by child elements.