phy: spear1340-miphy: Return proper error for spear1340_miphy_xlate

The of_xlate callback should return ERR_PTR on error.
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>

drivers/phy/phy-spear1340-miphy.c

@@ -229,14 +229,14 @@ static struct phy *spear1340_miphy_xlate(struct device *dev,
 
 	if (args->args_count < 1) {
 		dev_err(dev, "DT did not pass correct no of args\n");
-		return NULL;
+		return ERR_PTR(-ENODEV);
 	}
 
 	priv->mode = args->args[0];
 
 	if (priv->mode != SATA && priv->mode != PCIE) {
 		dev_err(dev, "DT did not pass correct phy mode\n");
-		return NULL;
+		return ERR_PTR(-ENODEV);
 	}
 
 	return priv->phy;