Remove unnecessary check from IPC sample.

No real changes, just remove a check for pointer passed to wxDELETE() bot
being NULL as wxDELETE() already checks for this anyhow.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@65781 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/ipc/client.cpp

@@ -232,10 +232,8 @@ void MyFrame::EnableControls()
 
 void MyFrame::OnClose(wxCloseEvent& event)
 {
-    if (m_client)
-    {
-        wxDELETE(m_client);
-    }
+    wxDELETE(m_client);
+
     event.Skip();
 }