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/univ/dialog.cpp

@@ -143,11 +143,7 @@ bool wxDialog::Show(bool show)
         // if we had disabled other app windows, reenable them back now because
         // if they stay disabled Windows will activate another window (one
         // which is enabled, anyhow) and we will lose activation
-        if ( m_windowDisabler )
-        {
-            delete m_windowDisabler;
-            m_windowDisabler = NULL;
-        }
+        wxDELETE(m_windowDisabler);
 
         if ( IsModal() )
             EndModal(wxID_CANCEL);

src/univ/menu.cpp

@@ -1096,11 +1096,7 @@ const wxMenuGeometryInfo& wxMenu::GetGeometryInfo() const
 
 void wxMenu::InvalidateGeometryInfo()
 {
-    if ( m_geometry )
-    {
-        delete m_geometry;
-        m_geometry = NULL;
-    }
+    wxDELETE(m_geometry);
 }
 
 // ----------------------------------------------------------------------------
@@ -2513,8 +2509,7 @@ bool wxWindow::DoPopupMenu(wxMenu *menu, int x, int y)
     ms_evtLoopPopup = new wxEventLoop;
     ms_evtLoopPopup->Run();
 
-    delete ms_evtLoopPopup;
-    ms_evtLoopPopup = NULL;
+    wxDELETE(ms_evtLoopPopup);
 
     // remove the handler
     PopEventHandler(true /* delete it */);

src/univ/scrolbar.cpp

@@ -933,11 +933,7 @@ void wxStdScrollBarInputHandler::StopScrolling(wxScrollBar *control)
 
     m_btnCapture = -1;
 
-    if ( m_timerScroll )
-    {
-        delete m_timerScroll;
-        m_timerScroll = NULL;
-    }
+    wxDELETE(m_timerScroll);
 
     // unpress the arrow and highlight the current element
     Press(control, false);