[pan] header-pane.cc: remove unused variable

[Dominique Dumont <ddumont src gnome org>]

commit 3843f30b2ab928623cfbd3f1035fde2556910cfd
Author: Dominique Dumont <dod debian org>
Date:   Sun Nov 14 18:45:06 2021 +0100

    header-pane.cc: remove unused variable

 pan/gui/header-pane.cc | 3 ---
 1 file changed, 3 deletions(-)
---
diff --git a/pan/gui/header-pane.cc b/pan/gui/header-pane.cc
index 08973b0..22718d3 100644
--- a/pan/gui/header-pane.cc
+++ b/pan/gui/header-pane.cc
@@ -265,10 +265,7 @@ HeaderPane :: render_author (GtkTreeViewColumn * ,
                             GtkTreeIter       * iter,
                             gpointer            user_data)
 {
-
   const HeaderPane * self (static_cast<HeaderPane*>(user_data));
-  const Row * row (dynamic_cast<Row*>(self->_tree_store->get_row (iter)));
-
   const Article * a (self->get_article (model, iter));
 
   g_object_set (renderer, "text", a->author.c_str() ,