[gtk/wip/sadiq/model-fixes] treelistmodel: Fix memory leak

[Mohammed Sadiq <pksadiq src gnome org>]

commit f211d71f747489c6b63ab804ea2c12ad4d625999
Author: Mohammed Sadiq <sadiq sadiqpk org>
Date:   Tue Sep 18 07:28:56 2018 +0530

    treelistmodel: Fix memory leak
    
    gtk_tree_list_model_init_node() increases the reference count
    of the model passed. Let's not do that, and let it take the
    model passed.

 gtk/gtktreelistmodel.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gtk/gtktreelistmodel.c b/gtk/gtktreelistmodel.c
index a7f6619d82..a612057d96 100644
--- a/gtk/gtktreelistmodel.c
+++ b/gtk/gtktreelistmodel.c
@@ -494,7 +494,7 @@ gtk_tree_list_model_init_node (GtkTreeListModel *list,
   gsize i, n;
   TreeNode *node;
 
-  self->model = g_object_ref (model);
+  self->model = model;
   g_signal_connect (model,
                     "items-changed",
                     G_CALLBACK (gtk_tree_list_model_items_changed_cb),