forcepoint #17 nTextBreak is an index into pKernArray of len rInf.GetLen()

Change-Id: I3afeaf987cc5e75362560165fea7230904530933
Reviewed-on: https://gerrit.libreoffice.org/50630Reviewed-by: Michael Stahl <mstahl@redhat.com>
Tested-by: Jenkins <ci@libreoffice.org>
(cherry picked from commit c21fbf68)

sw/source/core/txtnode/fntcache.cxx

@@ -2367,9 +2367,8 @@ sal_Int32 SwFont::GetTextBreak( SwDrawTextInfo& rInf, long nTextWidth )
             rInf.GetOut().GetTextArray( rInf.GetText(), pKernArray,
                                             rInf.GetIdx(), rInf.GetLen() );
             long nCurrPos = pKernArray[nTextBreak] + nGridWidthAdd;
-            while( nTextBreak < rInf.GetLen() && nTextWidth >= nCurrPos)
+            while (++nTextBreak < rInf.GetLen() && nTextWidth >= nCurrPos)
             {
-                nTextBreak++;
                 nCurrPos = pKernArray[nTextBreak] + nGridWidthAdd * ( nTextBreak + 1 );
             }
             delete[] pKernArray;