Git commits in Moodle 3.4.1 by David Herney

commit 5a6a4cef8b022d0807f34cfc806dbc029e98ad7d
Author: David Herney <davidherney@gmail.com>
Date:   Tue, 28 Nov 2017 09:18:12 +0800
Tag:    v3.4.1

MDL-60443 dataformat lib: Change a wrong variable name