coverity#1302656 Unchecked dynamic_cast

Change-Id: If84fc54892bbe65799b3bc344c700bb43bedc0cd

sw/source/core/unocore/unochart.cxx

@@ -1947,7 +1947,7 @@ SwChartDataSequence::SwChartDataSequence( const SwChartDataSequence &rObj ) :
     aColLabelText( SW_RES(STR_CHART2_COL_LABEL_TEXT) ),
     xDataProvider( rObj.pDataProvider ),
     pDataProvider( rObj.pDataProvider ),
-    pTableCrsr( dynamic_cast<SwUnoTableCrsr*>(rObj.pTableCrsr.get())->Clone() ),
+    pTableCrsr( dynamic_cast<SwUnoTableCrsr&>(*rObj.pTableCrsr.get()).Clone() ),
     aCursorDepend( this, pTableCrsr.get() ),
     _pPropSet( rObj._pPropSet )
 {
@@ -2032,7 +2032,7 @@ uno::Sequence< uno::Any > SAL_CALL SwChartDataSequence::getData()
                 // keep original cursor and make copy of it that gets handed
                 // over to the SwXCellRange object which takes ownership and
                 // thus will destroy the copy later.
-                SwXCellRange aRange( dynamic_cast<SwUnoTableCrsr*>(pTableCrsr.get())->Clone(), *pTableFormat, aDesc );
+                SwXCellRange aRange( dynamic_cast<SwUnoTableCrsr&>(*pTableCrsr.get()).Clone(), *pTableFormat, aDesc );
                 aRange.GetDataSequence( &aRes, 0, 0 );
             }
         }