error: accessing an element of the container does not require a call to
'data()'; did you mean to use 'operator[]'?

Change-Id: I022745aa84b80124f342ce6c596d51b4d904f012
Reviewed-on: https://gerrit.libreoffice.org/61820
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>