[IA64] uninitialised flags element could cause crashes

window is not zeroed, so the flags should be assigned, not modified.
This can lead to crashes at boot if the IO and Memory resources overlap.

Patch supplied by Matthew Wilcox
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/pci/pci.c

@@ -275,7 +275,7 @@ add_window (struct acpi_resource *res, void *data)
 			return AE_OK;
 
 		window = &info->controller->window[info->controller->windows++];
-		window->resource.flags |= flags;
+		window->resource.flags	= flags;
 		window->resource.start  = addr.min_address_range;
 		window->resource.end    = addr.max_address_range;
 		window->offset		= offset;