net: bcmasp: fix early exit leak with fixed phy

We are not deregistering the fixed phy link when hitting the early
exit condition. Add the correct early exit sequence.

Fixes: 490cb412007d ("net: bcmasp: Add support for ASP2.0 Ethernet controller")
Signed-off-by: Justin Chen <[e-mail]>
Reviewed-by: Florian Fainelli <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c

···
 		netdev_err(intf->ndev, "invalid PHY mode: %s for port %d\n",
 			   phy_modes(intf->phy_interface), intf->port);
 		ret = -EINVAL;
-		goto err_free_netdev;
+		goto err_deregister_fixed_link;
 	}
 
 	ret = of_get_ethdev_address(ndev_dn, ndev);
···
 
 	return intf;
 
+err_deregister_fixed_link:
+	if (of_phy_is_fixed_link(ndev_dn))
+		of_phy_deregister_fixed_link(ndev_dn);
 err_free_netdev:
 	free_netdev(ndev);
 err: