virtio_net: Reuse buffer free function

virtnet_rq_free_unused_buf() helper function to free the buffer
already exists. Avoid code duplication by reusing existing function.

Reviewed-by: Alexander Duyck <alexanderduyck@fb.com>
Reviewed-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Signed-off-by: Parav Pandit <parav@nvidia.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/virtio_net.c

@@ -1375,13 +1375,7 @@ static void receive_buf(struct virtnet_info *vi, struct receive_queue *rq,
 	if (unlikely(len < vi->hdr_len + ETH_HLEN)) {
 		pr_debug("%s: short packet %i\n", dev->name, len);
 		dev->stats.rx_length_errors++;
-		if (vi->mergeable_rx_bufs) {
-			put_page(virt_to_head_page(buf));
-		} else if (vi->big_packets) {
-			give_pages(rq, buf);
-		} else {
-			put_page(virt_to_head_page(buf));
-		}
+		virtnet_rq_free_unused_buf(rq->vq, buf);
 		return;
 	}