net: txgbe: use pci_dev_id() helper

PCI core API pci_dev_id() can be used to get the BDF number for a PCI
device. We don't need to compose it manually. Use pci_dev_id() to
simplify the code a little bit.
Signed-off-by: Yu Liao <liaoyu15@huawei.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20240826012100.3975175-1-liaoyu15@huawei.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/wangxun/txgbe/txgbe_phy.c

@@ -688,8 +688,7 @@ static int txgbe_ext_phy_init(struct txgbe *txgbe)
 	mii_bus->parent = &pdev->dev;
 	mii_bus->phy_mask = GENMASK(31, 1);
 	mii_bus->priv = wx;
-	snprintf(mii_bus->id, MII_BUS_ID_SIZE, "txgbe-%x",
-		 (pdev->bus->number << 8) | pdev->devfn);
+	snprintf(mii_bus->id, MII_BUS_ID_SIZE, "txgbe-%x", pci_dev_id(pdev));
 
 	ret = devm_mdiobus_register(&pdev->dev, mii_bus);
 	if (ret) {