PCI/AER: Use pci_dev_id() to simplify the code

When we have a struct pci_dev *, use pci_dev_id() instead of manually
composing the ID with PCI_DEVID() from dev->bus->number and dev->devfn.

[bhelgaas: commit log]
Link: https://lore.kernel.org/r/20230807134858.116051-3-wangxiongfeng2@huawei.com
Signed-off-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

Author: fenghusthu

drivers/pci/pcie/aer.c

@@ -712,7 +712,7 @@ static void __aer_print_error(struct pci_dev *dev,
 void aer_print_error(struct pci_dev *dev, struct aer_err_info *info)
 {
 	int layer, agent;
-	int id = ((dev->bus->number << 8) | dev->devfn);
+	int id = pci_dev_id(dev);
 	const char *level;
 
 	if (!info->status) {
@@ -847,7 +847,7 @@ static bool is_error_source(struct pci_dev *dev, struct aer_err_info *e_info)
 	if ((PCI_BUS_NUM(e_info->id) != 0) &&
 	    !(dev->bus->bus_flags & PCI_BUS_FLAGS_NO_AERSID)) {
 		/* Device ID match? */
-		if (e_info->id == ((dev->bus->number << 8) | dev->devfn))
+		if (e_info->id == pci_dev_id(dev))
 			return true;
 
 		/* Continue id comparing if there is no multiple error */