Fix off-by-one access and clarify loop
Fix off-by-one access and clarify loop

Change-Id: Iaf6fa4de07c04319e6a1846ae77c3ad02dc262a7
Reviewed-on: https://gerrit.libreoffice.org/5562
Reviewed-by: Michael Stahl <eef8671db506f9731c0438a7613853b6391ca841@redhat.com>
Tested-by: Michael Stahl <eef8671db506f9731c0438a7613853b6391ca841@redhat.com>

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core