tdf#89750: svx: fix ExternalToolEdit on Windows

While adding check that the temp file move succeeds, overlooked that the
file handle is actually leaked, which means the move will fail on WNT
because the file is already open.

(regression from ef490df2)

Change-Id: I779ccde79871930fef3bad7e17b633fb62e36a46

svx/source/core/extedit.cxx

@@ -113,9 +113,8 @@ void ExternalToolEdit::Edit(GraphicObject const*const pGraphicObject)
     OUString aTempFileBase;
     OUString aTempFileName;
 
-    oslFileHandle pHandle;
     osl::FileBase::RC rc =
-        osl::FileBase::createTempFile(0, &pHandle, &aTempFileBase);
+        osl::FileBase::createTempFile(nullptr, nullptr, &aTempFileBase);
     if (osl::FileBase::E_None != rc)
     {
         SAL_WARN("svx", "ExternalToolEdit::Edit: cannot create temp file");