[glibmm] Glib::HelperList: fix iterator check in operator[]

[Kjell Ahlstedt <kjellahl src gnome org>]

commit d6f7c5f69a8ee5935de75c87378b873967119100
Author: Maks Naumov <maksqwe1 ukr net>
Date:   Thu Jul 9 15:24:13 2015 +0200

    Glib::HelperList: fix iterator check in operator[]
    
    Signed-off-by: Maks Naumov <maksqwe1 ukr net> Bug #751530.

 glib/glibmm/helperlist.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/glib/glibmm/helperlist.h b/glib/glibmm/helperlist.h
index 1955be1..d9a1c95 100644
--- a/glib/glibmm/helperlist.h
+++ b/glib/glibmm/helperlist.h
@@ -117,7 +117,7 @@ public:
   {
     size_type j = 0;
     iterator i;
-    for(i = begin(), j = 0; i != end(), j < l; ++i, ++j)
+    for(i = begin(), j = 0; i != end() && j < l; ++i, ++j)
       ;
     return (*i);
   }