Reduce complexity of TreeHelper#lock_file_link

Signed-off-by: Rémy Coutable <remy@rymai.me>

app/helpers/tree_helper.rb

@@ -139,6 +139,11 @@ module TreeHelper
         end
       end
     else
+      _lock_link(current_user: current_user, project: project, html_options: {})
+    end
+  end
+
+  def _lock_link(current_user: current_user, project: project, html_options: {})
     if can?(current_user, :push_code, project)
       html_options[:data] = { state: :lock }
       enabled_lock_link("Lock", '', html_options)
@@ -146,7 +151,6 @@ module TreeHelper
       disabled_lock_link("Lock", "You do not have permission to lock this", html_options)
     end
   end
-  end
 
   def disabled_lock_link(label, title, html_options)
     html_options['data-toggle'] = 'tooltip'