vhost_net: Rename local variables in vhost_net_rx_peek_head_len

static int vhost_net_rx_peek_head_len(struct vhost_net *net, struct sock *sk)

{

	struct vhost_net_virtqueue *rvq = &net->vqs[VHOST_NET_VQ_RX];

	struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_TX];

	struct vhost_virtqueue *vq = &nvq->vq;

	struct vhost_net_virtqueue *rnvq = &net->vqs[VHOST_NET_VQ_RX];

	struct vhost_net_virtqueue *tnvq = &net->vqs[VHOST_NET_VQ_TX];

	struct vhost_virtqueue *tvq = &tnvq->vq;

	unsigned long uninitialized_var(endtime);

	int len = peek_head_len(rvq, sk);

	int len = peek_head_len(rnvq, sk);

	if (!len && vq->busyloop_timeout) {

	if (!len && tvq->busyloop_timeout) {

		/* Flush batched heads first */

		vhost_rx_signal_used(rvq);

		vhost_rx_signal_used(rnvq);

		/* Both tx vq and rx socket were polled here */

		mutex_lock_nested(&vq->mutex, 1);

		vhost_disable_notify(&net->dev, vq);

		mutex_lock_nested(&tvq->mutex, 1);

		vhost_disable_notify(&net->dev, tvq);

		preempt_disable();

		endtime = busy_clock() + vq->busyloop_timeout;

		endtime = busy_clock() + tvq->busyloop_timeout;

		while (vhost_can_busy_poll(&net->dev, endtime) &&

		       !sk_has_rx_data(sk) &&

		       vhost_vq_avail_empty(&net->dev, vq))

		       vhost_vq_avail_empty(&net->dev, tvq))

			cpu_relax();

		preempt_enable();

		if (!vhost_vq_avail_empty(&net->dev, vq))

			vhost_poll_queue(&vq->poll);

		else if (unlikely(vhost_enable_notify(&net->dev, vq))) {

			vhost_disable_notify(&net->dev, vq);

			vhost_poll_queue(&vq->poll);

		if (!vhost_vq_avail_empty(&net->dev, tvq)) {

			vhost_poll_queue(&tvq->poll);

		} else if (unlikely(vhost_enable_notify(&net->dev, tvq))) {

			vhost_disable_notify(&net->dev, tvq);

			vhost_poll_queue(&tvq->poll);

		}

		mutex_unlock(&vq->mutex);

		mutex_unlock(&tvq->mutex);

		len = peek_head_len(rvq, sk);

		len = peek_head_len(rnvq, sk);

	}

	return len;