Remove duplicate connection

Change-Id: I80759d23be9acd755d4e2787b77342c2908569dd
Reviewed-by: Leandro Melo <leandro.melo@nokia.com>

src/plugins/cppeditor/cpptypehierarchy.cpp

@@ -101,7 +101,6 @@ CppTypeHierarchyWidget::CppTypeHierarchyWidget(Core::IEditor *editor) :
         m_treeView->setRootIsDecorated(false);
         layout->addWidget(m_treeView);
 
-        connect(m_treeView, SIGNAL(clicked(QModelIndex)), this, SLOT(onItemClicked(QModelIndex)));
         connect(m_treeView, SIGNAL(clicked(QModelIndex)), this, SLOT(onItemClicked(QModelIndex)));
         connect(CppPlugin::instance(), SIGNAL(typeHierarchyRequested()), this, SLOT(perform()));
     } else {