tdf#105799 Fix vector use bug

Change-Id: Ibf2b5314584725a10e11fe83e9fef5c710e421c4
Reviewed-on: https://gerrit.libreoffice.org/73937
Tested-by: Jenkins
Reviewed-by: Jim Raykowski <raykowj@gmail.com>
diff --git a/sw/source/core/undo/untbl.cxx b/sw/source/core/undo/untbl.cxx
index 4ad7ccc..7e0775f 100644
--- a/sw/source/core/undo/untbl.cxx
+++ b/sw/source/core/undo/untbl.cxx
@@ -1287,7 +1287,7 @@
    else
    {
        sal_uLong nEnd = pDoc->GetNodes()[ nSttNode ]->EndOfSectionIndex();
        Ptrs.pContentAttrs = new SfxItemSets( static_cast<sal_uInt8>(nEnd - nSttNode - 1 ) );
        Ptrs.pContentAttrs = new SfxItemSets;
        for( sal_uLong n = nSttNode + 1; n < nEnd; ++n )
        {
            SwContentNode* pCNd = pDoc->GetNodes()[ n ]->GetContentNode();