conncheck: Connection check reply must have a remote candidate
Ensure that a conncheck reply is coming from an address and port of a known remote candidate and that the type of incoming socket matches that candidate's transport. Attemps to fix a Coverity issue in which no matching remote_candidate gets found for a connectivity reply in conn_check_handle_inbound_stun() (apparently due to transport mismatch), yet priv_map_reply_to_conn_check_request() still successfully matches it with a previous request.
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