Resolve TROVE-2020-004
This is a remotely triggerable memory leak on relays and clients, found by tobias pulls.
The issue is that when circpad_setup_machine_on_circ() is reached with an inconsistent internal configuration, it fails to free an object that is replaced. It logs a bug warning, but that isn't enough.
Tobias Pulls found that this code was actually reachable, though, and results in a memory leak.
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