x86/PCI: use pci_scan_bus() instead of pci_scan_bus_parented()

This doesn't change any functionality, but it makes a subsequent patch
slightly simpler.

pci_scan_bus(NULL, ...) and pci_scan_bus_parented() are identical except
that pci_scan_bus() also calls pci_bus_add_devices():

  pci_scan_bus_parented
    pci_create_bus
    pci_scan_child_bus

  pci_scan_bus
    pci_create_bus
    pci_scan_child_bus
    pci_bus_add_devices

All callers of pcibios_scan_root() call pci_bus_add_devices() explicitly,
and we don't pass a parent device, so we might as well use pci_scan_bus().

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

arch/x86/pci/common.c

@@ -456,7 +456,7 @@ struct pci_bus * __devinit pcibios_scan_root(int busnum)
 	sd->node = get_mp_bus_to_node(busnum);
 
 	printk(KERN_DEBUG "PCI: Probing PCI hardware (bus %02x)\n", busnum);
-	bus = pci_scan_bus_parented(NULL, busnum, &pci_root_ops, sd);
+	bus = pci_scan_bus(busnum, &pci_root_ops, sd);
 	if (!bus)
 		kfree(sd);
 

arch/x86/pci/legacy.c

@@ -31,9 +31,6 @@ int __init pci_legacy_init(void)
 
 	printk("PCI: Probing PCI hardware\n");
 	pci_root_bus = pcibios_scan_root(0);
-	if (pci_root_bus)
-		pci_bus_add_devices(pci_root_bus);
-
 	return 0;
 }
 

arch/x86/pci/numaq_32.c

@@ -153,8 +153,6 @@ int __init pci_numaq_init(void)
 	raw_pci_ops = &pci_direct_conf1_mq;
 
 	pci_root_bus = pcibios_scan_root(0);
-	if (pci_root_bus)
-		pci_bus_add_devices(pci_root_bus);
 	if (num_online_nodes() > 1)
 		for_each_online_node(quad) {
 			if (quad == 0)