Working on address types with name resolution, it seems it would perform better if get_manuf_name didn't have wmem_allocator with it. Looking into the code, I can model it after the ethernet name lookup where there's always a "hex string backup" in its hash table if name can't be found. But what I'm concerned about with that is eth_addr_resolve(), and possibly shutting out wka_name_lookup.
Patch can be found here:
https://code.wireshark.org/review/7075/, posting to the mailing list for greater visibility because I don't think I fully understand all of the ramifications that could happen if I submit the patch.