Patch merged into coreboot/master: ec/lenovo/h8: Fix IASL warnings

the following patch was just integrated into master:
commit 21dbc2fc3c2febe0e6ac3760f4c8a63c2aeedd06
Author: Martin Roth 
Date:   Mon Nov 23 12:23:19 2015 -0700

ec/lenovo/h8: Fix IASL warnings

If any path in a method returns a value, IASL expects that all paths
    within that method will return a value.

Presumably the MKHP method wouldn't get called unless there were a
    pending event, but if no event is found, return a zero.

Fixes IASL warning:
    dsdt.aml 1785: Method (MHKP, 0, NotSerialized)
    Warning 3115 -           ^ Not all control paths return a value (MHKP)

This was the only IASL warning in most lenovo mainboards.

Change-Id: Id93dcc4a74bd4c18b78f1dde821e7ba0f3444da3
    Signed-off-by: Martin Roth 
    Reviewed-on: https://review.coreboot.org/12517
    Tested-by: build bot (Jenkins)
    Reviewed-by: Stefan Reinauer

See https://review.coreboot.org/12517 for details.

-gerrit