Resolves: tdf#123815 null terminator included in string

regression from...

commit 18d636063fd7be165e7888af49372a6e2b851776
Author: Caolán McNamara <caolanm@redhat.com>
Date:   Mon Jun 19 09:46:31 2017 +0100

    ofz: use OString instead of bare char*

this is no use to the reporter though, as the document format is
10 and 11 is the oldest the filter will open

Change-Id: I4cdfe92e37f047493a6eab95f0e8e9f5dced1a35
Reviewed-on: https://gerrit.libreoffice.org/68746
Tested-by: Jenkins
Reviewed-by: Michael Stahl <Michael.Stahl@cib.de>
diff --git a/lotuswordpro/source/filter/tocread.cxx b/lotuswordpro/source/filter/tocread.cxx
index baf8418..043a216 100644
--- a/lotuswordpro/source/filter/tocread.cxx
+++ b/lotuswordpro/source/filter/tocread.cxx
@@ -291,7 +291,9 @@ CBenTOCReader::ReadTOC()
                        return Err;
                    }

                    OString sName(sBuffer, Length);
                    OString sName;
                    if (Length)
                        sName = OString(sBuffer, Length - 1);

                    CUtListElmt * pPrevNamedObjectListElmt;
                    if (FindNamedObject(&cpContainer->GetNamedObjects(),