[gnome-builder] rg: use g_ptr_array_unref

[Christian Hergert <chergert src gnome org>]

commit c9f9b6aeb9cfac41ae50fdfb20a33c2a715a2df1
Author: Christian Hergert <christian hergert me>
Date:   Mon Jun 1 20:46:53 2015 -0700

    rg: use g_ptr_array_unref
    
    Wrong destroy notify, fix it.

 contrib/rg/rg-table.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/contrib/rg/rg-table.c b/contrib/rg/rg-table.c
index 5f44089..d27c1d3 100644
--- a/contrib/rg/rg-table.c
+++ b/contrib/rg/rg-table.c
@@ -424,7 +424,7 @@ rg_table_finalize (GObject *object)
   RgTable *self = (RgTable *)object;
   RgTablePrivate *priv = rg_table_get_instance_private (self);
 
-  g_clear_pointer (&priv->columns, g_object_unref);
+  g_clear_pointer (&priv->columns, g_ptr_array_unref);
 
   G_OBJECT_CLASS (rg_table_parent_class)->finalize (object);
 }