Resolves: tdf#119700 save correct table:last-row-spanned

Regression from

    commit f6e6a613
    CommitDate: Mon Nov 21 07:49:06 2016 +0000

        tdf#48140 Replace uno CellRangeAddress and CellAddress with direct calls

that calculated endrow-startcol instead of endrow-startrow.

Change-Id: Ie576f9abdcdc23fc5f0a06735caadc24e975360f
Reviewed-on: https://gerrit.libreoffice.org/63374Reviewed-by: Eike Rathke <erack@redhat.com>
Tested-by: Jenkins

sc/source/filter/xml/XMLExportIterator.hxx

@@ -162,7 +162,7 @@ struct ScMyAreaLink
     ScMyAreaLink() : nRefresh( 0 ) {}
 
     sal_Int32            GetColCount() const { return aDestRange.aEnd.Col() - aDestRange.aStart.Col() + 1; }
-    sal_Int32            GetRowCount() const { return aDestRange.aEnd.Row() - aDestRange.aStart.Col() + 1; }
+    sal_Int32            GetRowCount() const { return aDestRange.aEnd.Row() - aDestRange.aStart.Row() + 1; }
 
     bool                        Compare( const ScMyAreaLink& rAreaLink ) const;
     bool                        operator<(const ScMyAreaLink& rAreaLink ) const;