ia64/PCI: Clear host bridge aperture struct resource

Use kzalloc() so the struct resource doesn't contain garbage in
fields we don't initialize.
Signed-off-by: NYinghai Lu <yinghai@kernel.org>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: linux-ia64@vger.kernel.org

arch/ia64/pci/pci.c

@@ -295,7 +295,6 @@ static __devinit acpi_status add_window(struct acpi_resource *res, void *data)
 	window->resource.flags = flags;
 	window->resource.start = addr.minimum + offset;
 	window->resource.end = window->resource.start + addr.address_length - 1;
-	window->resource.child = NULL;
 	window->offset = offset;
 
 	if (insert_resource(root, &window->resource)) {
@@ -357,7 +356,7 @@ pci_acpi_scan_root(struct acpi_pci_root *root)
 			&windows);
 	if (windows) {
 		controller->window =
-			kmalloc_node(sizeof(*controller->window) * windows,
+			kzalloc_node(sizeof(*controller->window) * windows,
 				     GFP_KERNEL, controller->node);
 		if (!controller->window)
 			goto out2;