r8169: use tp_to_dev instead of open code

The open code is defined as a helper function(tp_to_dev) on r8169_main.c,
which the open code is &tp->pci_dev->dev. The helper function was added
in commit 1e1205b7 ("r8169: add helper tp_to_dev"). And then later,
commit f1e911d5 ("r8169: add basic phylib support") added
r8169_phylink_handler function but it didn't use the helper function.
Thus, tp_to_dev() replaces the open code. This patch doesn't change logic.
Signed-off-by: Juhee Kang <claudiajkang@gmail.com>
Reviewed-by: Heiner Kallweit <hkallweit1@gmail.com>
Link: https://lore.kernel.org/r/20221129161244.5356-1-claudiajkang@gmail.comSigned-off-by: Paolo Abeni <pabeni@redhat.com>

drivers/net/ethernet/realtek/r8169_main.c

@@ -4559,12 +4559,13 @@ static int rtl8169_poll(struct napi_struct *napi, int budget)
 static void r8169_phylink_handler(struct net_device *ndev)
 {
 	struct rtl8169_private *tp = netdev_priv(ndev);
+	struct device *d = tp_to_dev(tp);
 
 	if (netif_carrier_ok(ndev)) {
 		rtl_link_chg_patch(tp);
-		pm_request_resume(&tp->pci_dev->dev);
+		pm_request_resume(d);
 	} else {
-		pm_runtime_idle(&tp->pci_dev->dev);
+		pm_runtime_idle(d);
 	}
 
 	phy_print_status(tp->phydev);