virtio_net: fix error return code in virtnet_probe()

Fix to return a negative error code from the failover create fail error
handling case instead of 0, as done elsewhere in this function.

Fixes: ba5e4426 ("virtio_net: Extend virtio to use VF datapath when available")
Signed-off-by: NWei Yongjun <weiyongjun1@huawei.com>
Acked-by: NJason Wang <jasowang@redhat.com>
Acked-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/virtio_net.c

@@ -2935,8 +2935,10 @@ static int virtnet_probe(struct virtio_device *vdev)
 
 	if (virtio_has_feature(vdev, VIRTIO_NET_F_STANDBY)) {
 		vi->failover = net_failover_create(vi->dev);
-		if (IS_ERR(vi->failover))
+		if (IS_ERR(vi->failover)) {
+			err = PTR_ERR(vi->failover);
 			goto free_vqs;
+		}
 	}
 
 	err = register_netdev(dev);