of_phy_connect() returns NULL on error, it never returns error pointers.
Fixes: 656e705243fd ('net-next: mediatek: add support for MT7623 ethernet')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: John Crispin <blogic@openwrt.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
 
        phydev = of_phy_connect(eth->netdev[mac->id], phy_node,
                                mtk_phy_link_adjust, 0, phy_mode);
-       if (IS_ERR(phydev)) {
+       if (!phydev) {
                dev_err(eth->dev, "could not connect to PHY\n");
-               return PTR_ERR(phydev);
+               return -ENODEV;
        }
 
        dev_info(eth->dev,