Fix leak in smEditWindow (starmath)

Change-Id: I7eb2af795d4b7d3619fe78ae16ea5796e5943f2c
Reviewed-on: https://gerrit.libreoffice.org/43221Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Julien Nabet <serval2412@yahoo.fr>

starmath/source/edit.cxx

@@ -28,6 +28,7 @@
 #include <editeng/editview.hxx>
 #include <editeng/editeng.hxx>
 #include <editeng/editstat.hxx>
+#include <o3tl/make_unique.hxx>
 #include <sfx2/dispatch.hxx>
 #include <svl/stritem.hxx>
 #include <sfx2/viewfrm.hxx>
@@ -961,9 +962,10 @@ void SmEditWindow::Flush()
         SmViewShell *pViewSh = rCmdBox.GetView();
         if (pViewSh)
         {
+            std::unique_ptr<SfxStringItem> pTextToFlush = o3tl::make_unique<SfxStringItem>(SID_TEXT, GetText());
             pViewSh->GetViewFrame()->GetDispatcher()->ExecuteList(
                     SID_TEXT, SfxCallMode::RECORD,
-                    { new SfxStringItem(SID_TEXT, GetText()) });
+                    { pTextToFlush.get() });
         }
     }
     if (aCursorMoveIdle.IsActive())