Use wxDELETE() and wxDELETEA() when possible.

Use wxDELETE[A]() functions which automatically NULL out their arguments after
deleting them instead of doing it manually.

Closes #9685.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@64656 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/fdrepdlg.cpp

@@ -443,8 +443,7 @@ bool wxFindReplaceDialog::Show(bool show)
         wxLogError(_("Failed to create the standard find/replace dialog (error code %d)"),
                    ::CommDlgExtendedError());
 
-        delete m_impl;
-        m_impl = NULL;
+        wxDELETE(m_impl);
 
         return false;
     }