Patch merged into coreboot/master: ACPI: Add hack to avoid IASL warning when reading back registers

the following patch was just integrated into master:
commit d890b45520a4b2af2ae2b15096b5897ed7464fcb
Author: Martin Roth 
Date:   Thu Dec 10 08:04:44 2015 -0700

ACPI: Add hack to avoid IASL warning when reading back registers

Upcoming versions of IASL give a warning about unused methods.  This
    adds an operation after the read to use the local variable and avoid
    the warning.

The warning can be completely disabled on the command line, but as it
    can find real issues, my preference is to not do that.

Fixes warnings:
    dsdt.aml 640: 		           Store (CTMP, Local0)
    Warning  3144 - Method Local is set but never used ^  (Local0)

Change-Id: If55bb8e03abb8861e1f2f08a8bcb1be8c9783afe
    Signed-off-by: Martin Roth 
    Reviewed-on: https://review.coreboot.org/12704
    Tested-by: build bot (Jenkins)
    Reviewed-by: Stefan Reinauer

See https://review.coreboot.org/12704 for details.

-gerrit