tdf#123637 sw_redlinehide: fix iteration in SwCursorShell::GotoNextOutline()

If nStartPos == size() and !bUseFirst.

(regression from d0e9cc832d)

Change-Id: I571d24ec5e9d4f2780e7c6d5c8cee09baeaffcc1
Reviewed-on: https://gerrit.libreoffice.org/68821
Tested-by: Jenkins
Reviewed-by: Michael Stahl <Michael.Stahl@cib.de>

sw/source/core/crsr/crstrvl.cxx

@@ -1033,14 +1033,14 @@ bool SwCursorShell::GotoNextOutline()
 
     do
     {
-        if (nPos == rNds.GetOutLineNds().size())
+        if (!bUseFirst)
-        {
-            nPos = 0;
-        }
-        else if (!bUseFirst)
         {
             ++nPos;
         }
+        if (rNds.GetOutLineNds().size() <= nPos)
+        {
+            nPos = 0;
+        }
 
         if (bUseFirst)
         {