fix crash when canceling the chart wizard

Change-Id: Iebd9db279e9db22bc273509cf480737d7c7a1dd6

sc/source/ui/drawfunc/fuins2.cxx

@@ -724,7 +724,7 @@ FuInsertChart::FuInsertChart(ScTabViewShell* pViewSh, Window* pWin, ScDrawView*
                         sal_Int16 nDialogRet = xDialog->execute();
                         if( nDialogRet == ui::dialogs::ExecutableDialogResults::CANCEL )
                         {
-                            delete pWindow;
+                            delete pChildWindow;
                             // leave OLE inplace mode and unmark
                             OSL_ASSERT( pViewShell );
                             OSL_ASSERT( pView );