[gthumb] fixed wrong cast

[Paolo Bacchilega <paobac src gnome org>]

commit 5eab5918981956303301d70d16fb172eb05ae626
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Wed Aug 17 16:48:12 2016 +0200

    fixed wrong cast

 extensions/find_duplicates/gth-find-duplicates.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/extensions/find_duplicates/gth-find-duplicates.c 
b/extensions/find_duplicates/gth-find-duplicates.c
index e8c6561..64bcf8a 100644
--- a/extensions/find_duplicates/gth-find-duplicates.c
+++ b/extensions/find_duplicates/gth-find-duplicates.c
@@ -1367,7 +1367,7 @@ gth_find_duplicates_exec (GthBrowser *browser,
        gth_file_list_set_thumb_size (GTH_FILE_LIST (self->priv->duplicates_list), 112);
        gtk_widget_set_size_request (self->priv->duplicates_list, 750, 300);
        gtk_widget_show (self->priv->duplicates_list);
-       gtk_box_pack_start (GTK_CONTAINER (GET_WIDGET ("duplicates_list_box")), self->priv->duplicates_list, 
TRUE, TRUE, 0);
+       gtk_box_pack_start (GTK_BOX (GET_WIDGET ("duplicates_list_box")), self->priv->duplicates_list, TRUE, 
TRUE, 0);
 
        self->priv->select_button = gtk_menu_button_new ();
        gtk_container_add (GTK_CONTAINER (self->priv->select_button), gtk_label_new (_("Select")));