[niepce] ui: fix an unused assignment

[Hubert Figuière <hub src gnome org>]

commit 3a2454d8af080cf8698b0f0301512402c9dd4b9b
Author: Hubert Figuière <hub figuiere net>
Date:   Sun Jul 30 22:22:12 2017 -0400

    ui: fix an unused assignment

 src/niepce/ui/imageliststore.cpp |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)
---
diff --git a/src/niepce/ui/imageliststore.cpp b/src/niepce/ui/imageliststore.cpp
index c5c1c28..c6ce1ec 100644
--- a/src/niepce/ui/imageliststore.cpp
+++ b/src/niepce/ui/imageliststore.cpp
@@ -107,8 +107,7 @@ void ImageListStore::on_lib_notification(const eng::LibNotification &ln)
         // clear the map before the list.
         m_idmap.clear();
         clear();
-        eng::LibFile::List::const_iterator iter = l->begin();
-        for_each(l->begin(), l->end(),
+        for_each(l->cbegin(), l->cend(),
                  [this](const eng::LibFile::Ptr & f) {
                      Gtk::TreeModel::iterator riter = append();
                      Gtk::TreeRow row = *riter;