Function submit_receive

examples/proxy.c:739–742

* One directional just arms receive on our in_fd */

 * One directional just arms receive on our in_fd
 */
static void submit_receive(struct io_uring *ring, struct conn *c)
{
	__submit_receive(ring, c, &c->cd[0], c->in_fd);
}

/*
 * Bi-directional arms receive on both in and out fd