net/virtio-user: fix Rx interrupts with multi-queue

The callfds[] array stores eventfds sequentially for Rx and Tx vq.

Fixes: d61138d ("drivers: remove direct access to interrupt handle")
Cc: stable@dpdk.org

Signed-off-by: Yuan Wang <yuanx.wang@intel.com>
Reviewed-by: David Marchand <david.marchand@redhat.com>

drivers/net/virtio/virtio_user/virtio_user_dev.c

@@ -417,7 +417,7 @@ virtio_user_fill_intr_handle(struct virtio_user_dev *dev)
 
 	for (i = 0; i < dev->max_queue_pairs; ++i) {
 		if (rte_intr_efds_index_set(eth_dev->intr_handle, i,
-				dev->callfds[i]))
+				dev->callfds[2 * i + VTNET_SQ_RQ_QUEUE_IDX]))
 			return -rte_errno;
 	}