[evince] Fix memory leak

[Carlos Garcia Campos <carlosgc src gnome org>]

commit 1212c58a7a21f8a0a787274133a04cdc54427069
Author: Carlos Garcia Campos <carlosgc gnome org>
Date:   Thu Jun 19 13:01:01 2014 +0200

    Fix memory leak

 shell/ev-window.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/shell/ev-window.c b/shell/ev-window.c
index e07de0a..f014ee2 100644
--- a/shell/ev-window.c
+++ b/shell/ev-window.c
@@ -5575,6 +5575,7 @@ ev_window_dispose (GObject *object)
                g_object_unref (priv->bookmarks_action_group);
                priv->bookmarks_action_group = NULL;
        }
+       g_clear_object (&priv->bookmarks_menu);
 
        if (priv->recent_manager) {
                priv->recent_manager = NULL;