PCI: convert pci_scan_bus_parented() to use pci_create_root_bus()

This converts pci_scan_bus_parented() to use pci_create_root_bus()
instead of pci_create_bus().  The new bus still has the default (incorrect)
resources, so this patch doesn't help fix that problem, but it does remove
one more use of pci_create_bus().
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

drivers/pci/probe.c

@@ -1640,11 +1640,16 @@ struct pci_bus *pci_create_bus(struct device *parent,
 struct pci_bus * __devinit pci_scan_bus_parented(struct device *parent,
 		int bus, struct pci_ops *ops, void *sysdata)
 {
+	LIST_HEAD(resources);
 	struct pci_bus *b;
 
-	b = pci_create_bus(parent, bus, ops, sysdata);
+	pci_add_resource(&resources, &ioport_resource);
+	pci_add_resource(&resources, &iomem_resource);
+	b = pci_create_root_bus(parent, bus, ops, sysdata, &resources);
 	if (b)
 		b->subordinate = pci_scan_child_bus(b);
+	else
+		pci_free_resource_list(&resources);
 	return b;
 }
 EXPORT_SYMBOL(pci_scan_bus_parented);