[evolution] MessageList: Fix an unused variable warning.

[Matthew Barnes <mbarnes src gnome org>]

commit 457d2ea1401f3d60abff812cfeea4d7864c520e3
Author: Matthew Barnes <mbarnes redhat com>
Date:   Wed Jun 19 14:36:51 2013 -0400

    MessageList: Fix an unused variable warning.

 mail/message-list.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/mail/message-list.c b/mail/message-list.c
index d6a2248..987a74b 100644
--- a/mail/message-list.c
+++ b/mail/message-list.c
@@ -2707,7 +2707,6 @@ static guint
 message_list_get_n_nodes (ETreeModel *tree_model)
 {
        ETreePath root;
-       guint n_nodes = 0;
 
        root = e_tree_model_get_root (tree_model);