net/ethernet/sfc: Don't use of_node_to_eeh_dev()

This is deprecated, it forces the driver to hop via the OF node
that may or may not exist, instead use pci_dev_to_eeh_dev() which
is simpler.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Shradha Shah <sshah@solarflare.com>
diff --git a/drivers/net/ethernet/sfc/siena.c b/drivers/net/ethernet/sfc/siena.c
index 3583f02..f12c811 100644
--- a/drivers/net/ethernet/sfc/siena.c
+++ b/drivers/net/ethernet/sfc/siena.c
@@ -205,8 +205,7 @@
  */
 static void siena_monitor(struct efx_nic *efx)
 {
-	struct eeh_dev *eehdev =
-		of_node_to_eeh_dev(pci_device_to_OF_node(efx->pci_dev));
+	struct eeh_dev *eehdev = pci_dev_to_eeh_dev(efx->pci_dev);
 
 	eeh_dev_check_failure(eehdev);
 }