g_order_check
gss_int32 g_order_check (void **queue, gssint_uint64 seqnum);
err = g_order_check(&ctx->seqstate, seqnum);
err = g_order_check(&ctx->seqstate, seqnum);
retval = g_order_check(&(ctx->seqstate), (gssint_uint64)seqnum);