qc_set_default_xso_keep_ref
qc_set_default_xso_keep_ref(ctx.qc, NULL, /*touch=*/1, &xso);
static void qc_set_default_xso_keep_ref(QUIC_CONNECTION *qc, QUIC_XSO *xso,
qc_set_default_xso_keep_ref(qc, xso, touch, &old_xso);