fix variable name

Change-Id: I170f0390f8f510591d444f44c20434b15077e687
(cherry picked from commit b38de1f8f3712f0a632ff9b6fa10df2cf3ce268f)
Reviewed-on: https://gerrit.libreoffice.org/11170
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>