all: some m_d -> d style

Change-Id: Iac1f12980bf47666007817cfb2c64a6d1e9b780e
Reviewed-on: http://codereview.qt-project.org/4477
Reviewed-by: hjk <qthjk@ovi.com>

src/plugins/cpptools/cpptoolssettings.h

@@ -69,7 +69,7 @@ public:
     TextEditor::TabPreferences *tabPreferences() const;
 
 private:
-    Internal::CppToolsSettingsPrivate *m_d;
+    Internal::CppToolsSettingsPrivate *d;
 
     static CppToolsSettings *m_instance;
 };