[PATCH] net: mdio: fix duplicate registrations for phy with c45 in __of_mdiobus_register()

[Jianhui Zhao]

__of_mdiobus_register
    __mdiobus_register
        mdiobus_scan_bus_c45
    of_mdiobus_child_is_phy
        of_mdiobus_register_phy
            fwnode_mdiobus_register_phy
                is_c45 = fwnode_device_is_compatible(child, "ethernet-phy-ieee802.3-c45");
                    get_phy_device
						phy_device_create

This is the function call chain. If a phy is already registered in
mdiobus_scan_bus_c45(), and it's compatible "ethernet-phy-ieee802.3-c45",
thus it will duplicated call get_phy_device later.