Simplify dynamic_cast followed by a static_cast.

Change-Id: Ie4b92f3763d2d695709a4919faceb520f874897f
diff --git a/xmloff/source/chart/SchXMLPlotAreaContext.cxx b/xmloff/source/chart/SchXMLPlotAreaContext.cxx
index 04b31d8..65ddc9a 100644
--- a/xmloff/source/chart/SchXMLPlotAreaContext.cxx
+++ b/xmloff/source/chart/SchXMLPlotAreaContext.cxx
@@ -798,18 +798,17 @@ void SchXMLWallFloorContext::StartElement( const uno::Reference< xml::sax::XAttr
                                                     ? mxWallFloorSupplier->getWall()
                                                     : mxWallFloorSupplier->getFloor(),
                                                     uno::UNO_QUERY );
        if( xProp.is())
        if (xProp.is())
        {
            if( !sAutoStyleName.isEmpty())
            if (!sAutoStyleName.isEmpty())
            {
                const SvXMLStylesContext* pStylesCtxt = mrImportHelper.GetAutoStylesContext();
                if( pStylesCtxt )
                if (pStylesCtxt)
                {
                    const SvXMLStyleContext* pStyle = pStylesCtxt->FindStyleChildContext(
                        SchXMLImportHelper::GetChartFamilyID(), sAutoStyleName );
                    SvXMLStyleContext* pStyle = const_cast<SvXMLStyleContext*>(pStylesCtxt->FindStyleChildContext(SchXMLImportHelper::GetChartFamilyID(), sAutoStyleName));

                    if( pStyle && dynamic_cast< const XMLPropStyleContext*>(pStyle) !=  nullptr)
                        const_cast<XMLPropStyleContext*>( static_cast<const XMLPropStyleContext*>( pStyle ) )->FillPropertySet( xProp );
                    if (XMLPropStyleContext* pPropStyle = dynamic_cast<XMLPropStyleContext*>(pStyle))
                        pPropStyle->FillPropertySet(xProp);
                }
            }
        }
@@ -870,16 +869,16 @@ void SchXMLStockContext::StartElement( const uno::Reference< xml::sax::XAttribut
                    xProp = mxStockPropProvider->getMinMaxLine();
                    break;
            }
            if( xProp.is())

            if (xProp.is())
            {
                const SvXMLStylesContext* pStylesCtxt = mrImportHelper.GetAutoStylesContext();
                if( pStylesCtxt )
                if (pStylesCtxt)
                {
                    const SvXMLStyleContext* pStyle = pStylesCtxt->FindStyleChildContext(
                        SchXMLImportHelper::GetChartFamilyID(), sAutoStyleName );
                    SvXMLStyleContext* pStyle = const_cast<SvXMLStyleContext*>(pStylesCtxt->FindStyleChildContext(SchXMLImportHelper::GetChartFamilyID(), sAutoStyleName));

                    if( pStyle && dynamic_cast< const XMLPropStyleContext*>(pStyle) !=  nullptr)
                        const_cast<XMLPropStyleContext*>( static_cast<const XMLPropStyleContext*>( pStyle ) )->FillPropertySet( xProp );
                    if (XMLPropStyleContext* pPropStyle = dynamic_cast<XMLPropStyleContext*>(pStyle))
                        pPropStyle->FillPropertySet(xProp);
                }
            }
        }