Fix crash caused by pointer convertsion in drag sample

Samples/basic/drag/src/DragListener.cpp

@@ -42,7 +42,7 @@ void DragListener::ProcessEvent(Rocket::Core::Event& event)
 	{
 		Rocket::Core::Element* dest_container = event.GetCurrentElement();
 		Rocket::Core::Element* dest_element = event.GetTargetElement();
-		Rocket::Core::Element* drag_element = *static_cast< Rocket::Core::Element** >(event.GetParameter< void* >("drag_element", NULL));
+		Rocket::Core::Element* drag_element = static_cast< Rocket::Core::Element* >(event.GetParameter< void* >("drag_element", NULL));
 
 		if (dest_container == dest_element)
 		{