coverity#704345 Logically dead code

Change-Id: I72360ada3abedc75b2718742e8a038eb6d214f0c
Reviewed-on: https://gerrit.libreoffice.org/3047Reviewed-by: Petr Mladek <pmladek@suse.cz>
Tested-by: Petr Mladek <pmladek@suse.cz>

sw/source/core/crsr/crsrsh.cxx

@@ -925,7 +925,8 @@ int SwCrsrShell::CompareCursor( CrsrCompareType eType ) const
     int nRet = 0;
     const SwPosition *pFirst = 0, *pSecond = 0;
     const SwPaM *pCur = GetCrsr(), *pStk = pCrsrStk;
-    if( CurrPtCurrMk != eType && pStk )
+    // cursor on stack is needed if we compare against stack
+    if( pStk || ( eType == CurrPtCurrMk ) )
     {
         switch ( eType)
         {