guard against infinite recursion

Change-Id: I43e195df570990f21c780311a98be64b682e5315
(cherry picked from commit 338c6ba3)
Reviewed-on: https://gerrit.libreoffice.org/20582Reviewed-by: David Tardon <dtardon@redhat.com>
Tested-by: David Tardon <dtardon@redhat.com>

lotuswordpro/source/filter/lwpdoc.cxx

@@ -540,7 +540,7 @@ LwpDocument* LwpDocument::GetPreviousDivision()
 
     LwpDocument* pDivision = GetLastDivision();
 
-    while(pDivision)
+    while (pDivision && pDivision != this)
     {
         LwpDocument* pContentDivision = pDivision->GetLastDivisionWithContents();
         if(pContentDivision)