ch_get_qlog_cb
qtx_args.get_qlog_cb = ch_get_qlog_cb;
txp_args.get_qlog_cb = ch_get_qlog_cb;
ossl_qtx_set_qlog_cb(ch->qtx, ch_get_qlog_cb, ch);
ossl_quic_tx_packetiser_set_qlog_cb(ch->txp, ch_get_qlog_cb, ch);