Patch merged into coreboot/master: UDC: Correct cleaning out memory for string descriptors

the following patch was just integrated into master:
commit a4b718cc2d3e4e23d78d413909344bb06f31d43f
Author: Furquan Shaikh 
Date:   Tue Jun 23 12:33:53 2015 -0700

UDC: Correct cleaning out memory for string descriptors

BUG=chrome-os-partner:41687
    BRANCH=None
    TEST=Compiles successfully and fastboot devices reports correct serial
    number even after re-connection.

Change-Id: I4741a5d6333523eb47c27b4a20c4ef3f1e853d76
    Signed-off-by: Patrick Georgi 
    Original-Commit-Id: 6249b1e35391550d788f56a7b3e7a49ae19f0c93
    Original-Change-Id: I1348c33f354d11e3c29ccd9da9948cfbeb60aa9e
    Original-Signed-off-by: Furquan Shaikh 
    Original-Reviewed-on: https://chromium-review.googlesource.com/281192
    Original-Trybot-Ready: Furquan Shaikh 
    Original-Tested-by: Furquan Shaikh 
    Original-Reviewed-by: Patrick Georgi 
    Original-Commit-Queue: Furquan Shaikh 
    Reviewed-on: http://review.coreboot.org/10687
    Tested-by: build bot (Jenkins)
    Reviewed-by: Stefan Reinauer

See http://review.coreboot.org/10687 for details.

-gerrit