virtio_ring: remove the arg vq of vring_alloc_desc_extra()

The parameter vq of vring_alloc_desc_extra() is useless. This patch
removes this parameter.

Subsequent patches will call this function to avoid passing useless
arguments.
Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20220624025621.128843-6-xuanzhuo@linux.alibaba.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

drivers/virtio/virtio_ring.c

@@ -1637,8 +1637,7 @@ static void *virtqueue_detach_unused_buf_packed(struct virtqueue *_vq)
 	return NULL;
 }
 
-static struct vring_desc_extra *vring_alloc_desc_extra(struct vring_virtqueue *vq,
-						       unsigned int num)
+static struct vring_desc_extra *vring_alloc_desc_extra(unsigned int num)
 {
 	struct vring_desc_extra *desc_extra;
 	unsigned int i;
@@ -1759,7 +1758,7 @@ static struct virtqueue *vring_create_virtqueue_packed(
 	/* Put everything in free lists. */
 	vq->free_head = 0;
 
-	vq->packed.desc_extra = vring_alloc_desc_extra(vq, num);
+	vq->packed.desc_extra = vring_alloc_desc_extra(num);
 	if (!vq->packed.desc_extra)
 		goto err_desc_extra;
 
@@ -2248,7 +2247,7 @@ struct virtqueue *__vring_new_virtqueue(unsigned int index,
 	if (!vq->split.desc_state)
 		goto err_state;
 
-	vq->split.desc_extra = vring_alloc_desc_extra(vq, vring.num);
+	vq->split.desc_extra = vring_alloc_desc_extra(vring.num);
 	if (!vq->split.desc_extra)
 		goto err_extra;