[libsigcplusplus] visit_each_type(): Remove unnecessary intermediate alias.

[Murray Cumming <murrayc src gnome org>]

commit eb6c47f3dd3260f31ca361547c4f9a7220e51ea2
Author: Murray Cumming <murrayc murrayc com>
Date:   Fri Apr 15 09:45:20 2016 +0200

    visit_each_type(): Remove unnecessary intermediate alias.

 sigc++/visit_each.h |    4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)
---
diff --git a/sigc++/visit_each.h b/sigc++/visit_each.h
index 7d0cc8b..e6e9f8f 100644
--- a/sigc++/visit_each.h
+++ b/sigc++/visit_each.h
@@ -198,9 +198,7 @@ template <class T_type, class T_action, class T_functor>
 void
 visit_each_type(const T_action& _A_action, const T_functor& _A_functor)
 {
-  using type_limited_action = internal::limit_derived_target<T_type, T_action>;
-
-  type_limited_action limited_action(_A_action);
+  internal::limit_derived_target<T_type, T_action> limited_action(_A_action);
 
   sigc::visit_each(limited_action, _A_functor);
 }