Patch merged into coreboot/master: 0ea0704 arm64: check for NULL bus on DEVICE_PATH_CPU_CLUSTER devices

the following patch was just integrated into master:
commit 0ea070452aada5cd50be19d664705d9263294fde
Author: Aaron Durbin 
Date:   Thu Sep 11 16:03:17 2014 -0500

arm64: check for NULL bus on DEVICE_PATH_CPU_CLUSTER devices

If there are no devices underneath a device in a devicetree the
    bus pointer in a struct device is NULL. Check for this condition
    before proceeding in walking through the children devices.

BUG=chrome-os-partner:31761
    BRANCH=None
    TEST=Ran through coreboot w/o any devices under the cpu_cluster device.
         No more exceptions.

Change-Id: I9aedbc0dffc638b878bd0ffacfa318b6eb30d504
    Signed-off-by: Patrick Georgi 
    Original-Commit-Id: d21e181077eba3c5ee03afca1738a24c21a8fc19
    Original-Change-Id: I891aeb36319dce67ce9e431156c85c74177c7ab7
    Original-Signed-off-by: Aaron Durbin 
    Original-Reviewed-on: https://chromium-review.googlesource.com/217511
    Original-Reviewed-by: Tom Warren 
    Original-Reviewed-by: Furquan Shaikh 
    Reviewed-on: http://review.coreboot.org/9066
    Tested-by: build bot (Jenkins)
    Reviewed-by: Stefan Reinauer

See http://review.coreboot.org/9066 for details.

-gerrit