fix data fixup helper method definition

Change-Id: I5d0a754db2b1443208825dd4918b2ad82953cd5a
Reviewed-on: https://gerrit.instructure.com/28931
Reviewed-by: Simon Williams <simon@instructure.com>
Reviewed-by: Rob Orton <rob@instructure.com>
Tested-by: Brian Palmer <brianp@instructure.com>
QA-Review: Brian Palmer <brianp@instructure.com>
Product-Review: Brian Palmer <brianp@instructure.com>