net: enetc: propagate the return code from phy_startup() to eth_ops::start

Make sure that errors in the PHY driver .startup() method, such as no
link, are propagated and not ignored.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
diff --git a/drivers/net/fsl_enetc.c b/drivers/net/fsl_enetc.c
index 6a5a38c..566cdc7 100644
--- a/drivers/net/fsl_enetc.c
+++ b/drivers/net/fsl_enetc.c
@@ -568,11 +568,9 @@
 	enetc_setup_tx_bdr(dev);
 	enetc_setup_rx_bdr(dev);
 
-	phy_startup(priv->phy);
-
 	enetc_setup_mac_iface(dev, priv->phy);
 
-	return 0;
+	return phy_startup(priv->phy);
 }
 
 /*