Patch merged into coreboot/master: libpayload: queue: Add a helper macro for checking singleton queue

the following patch was just integrated into master:
commit 1dcb10eeb6912824ddf257dab8121a2a87260a3d
Author: Furquan Shaikh 
Date:   Fri Nov 6 22:20:15 2015 -0800

libpayload: queue: Add a helper macro for checking singleton queue

Check if the simple queue consists of only 1 element.

BUG=b:24676003
    BRANCH=None
    TEST=Compiles successfully.

Change-Id: Ib257a5e6b9042b42c549f8ad8b943e3b75fd8c9c
    Signed-off-by: Patrick Georgi 
    Original-Commit-Id: 5435d6fec1c4fbb4c04ba5b8c15caff9ee4e50f0
    Original-Change-Id: I7a8cb9c4e7e71956e85e65b3e7b8e0af4d354110
    Original-Signed-off-by: Furquan Shaikh 
    Original-Reviewed-on: https://chromium-review.googlesource.com/311256
    Original-Commit-Ready: Furquan Shaikh 
    Original-Tested-by: Furquan Shaikh 
    Original-Reviewed-by: Aaron Durbin 
    Reviewed-on: http://review.coreboot.org/12412
    Reviewed-by: Furquan Shaikh 
    Tested-by: build bot (Jenkins)

See http://review.coreboot.org/12412 for details.

-gerrit