x86/PCI: print domain:bus in conventional format

Use the dev_printk-like "%04x:%02x" format for printing PCI bus numbers.
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

arch/x86/pci/acpi.c

@@ -172,8 +172,9 @@ struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_device *device, int do
 #endif
 
 	if (domain && !pci_domains_supported) {
-		printk(KERN_WARNING "PCI: Multiple domains not supported "
-		       "(dom %d, bus %d)\n", domain, busnum);
+		printk(KERN_WARNING "pci_bus %04x:%02x: "
+		       "ignored (multiple domains not supported)\n",
+		       domain, busnum);
 		return NULL;
 	}
 
@@ -197,7 +198,8 @@ struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_device *device, int do
 	 */
 	sd = kzalloc(sizeof(*sd), GFP_KERNEL);
 	if (!sd) {
-		printk(KERN_ERR "PCI: OOM, not probing PCI bus %02x\n", busnum);
+		printk(KERN_WARNING "pci_bus %04x:%02x: "
+		       "ignored (out of memory)\n", domain, busnum);
 		return NULL;
 	}