eo-cxx: Removed pessimization use of std::move

Local variables, when returned, are already moved or copy-elised. The
use of std::move removes the possibility of copy-elision, making it
possibly slower. Removed the wrong std::move use.

src/bindings/eo_cxx/eo_event.hh

@@ -116,7 +116,7 @@ signal_connection make_signal_connection(std::unique_ptr<F>& data, Eo* eo, ::Eo_
 {
   signal_connection c(_event_deleter<F>(data.get(), eo, cb, description));
   data.release();
-  return std::move(c);
+  return c;
 }
 
 namespace _detail {