Use simpler Plugin::initialize() when feasible

Change-Id: I567965d266f20526bda9f823e31a04b354d53fb1
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/todo/todoplugin.cpp

@@ -107,14 +107,9 @@ TodoPlugin::~TodoPlugin()
     delete d;
 }
 
-bool TodoPlugin::initialize(const QStringList& args, QString *errMsg)
+void TodoPlugin::initialize()
 {
-    Q_UNUSED(args)
-    Q_UNUSED(errMsg)
-
     d = new TodoPluginPrivate;
-
-    return true;
 }
 
 } // namespace Internal

src/plugins/todo/todoplugin.h

@@ -18,7 +18,7 @@ public:
     TodoPlugin();
     ~TodoPlugin() final;
 
-    bool initialize(const QStringList &arguments, QString *errorString) final;
+    void initialize() final;
 
 private:
     class TodoPluginPrivate *d = nullptr;