[gtksourceview/gtksourcecompletion] Make sure to ref_sink the completion since it now is a GInitiallyUnowned

[Jesse van den Kieboom <jessevdk src gnome org>]

commit 1a8185b296aec4d61378f8f68bccb006b7ff6a27
Author: Jesse van den Kieboom <jessevdk gnome org>
Date:   Sun Sep 20 00:13:54 2009 +0200

    Make sure to ref_sink the completion since it now is a GInitiallyUnowned
    
    Actually, it is a GtkObject to use GtkBindingSet, which in turn is a
    GInitiallyUnowned.

 gtksourceview/gtksourceview.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gtksourceview/gtksourceview.c b/gtksourceview/gtksourceview.c
index dc2fe99..51a96ce 100644
--- a/gtksourceview/gtksourceview.c
+++ b/gtksourceview/gtksourceview.c
@@ -4109,6 +4109,7 @@ gtk_source_view_get_completion (GtkSourceView *view)
 	if (view->priv->completion == NULL)
 	{
 		view->priv->completion = gtk_source_completion_new (view);
+		g_object_ref_sink (view->priv->completion);
 	}
 	
 	return view->priv->completion;