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/toolbar.cpp

@@ -405,11 +405,7 @@ void wxToolBar::Recreate()
         m_hBitmap = 0;
     }
 
-    if ( m_disabledImgList )
-    {
-        delete m_disabledImgList;
-        m_disabledImgList = NULL;
-    }
+    wxDELETE(m_disabledImgList);
 
     Realize();
 }
@@ -610,11 +606,7 @@ bool wxToolBar::DoDeleteTool(size_t pos, wxToolBarToolBase *tool)
 
 void wxToolBar::CreateDisabledImageList()
 {
-    if (m_disabledImgList != NULL)
-    {
-        delete m_disabledImgList;
-        m_disabledImgList = NULL;
-    }
+    wxDELETE(m_disabledImgList);
 
     // as we can't use disabled image list with older versions of comctl32.dll,
     // don't even bother creating it