[tracker] libtracker-data: Check tracker_data_delete_statement arguments

[Jürg Billeter <juergbi src gnome org>]

commit 5e5a6157c00112037862d87e1cd0601148078261
Author: Jürg Billeter <j bitron ch>
Date:   Tue Aug 4 10:45:07 2009 +0200

    libtracker-data: Check tracker_data_delete_statement arguments

 src/libtracker-data/tracker-data-update.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/src/libtracker-data/tracker-data-update.c b/src/libtracker-data/tracker-data-update.c
index 9869aef..673d864 100644
--- a/src/libtracker-data/tracker-data-update.c
+++ b/src/libtracker-data/tracker-data-update.c
@@ -722,6 +722,10 @@ tracker_data_delete_statement (const gchar            *subject,
 	gint		    subject_id;
 	GPtrArray          *types;
 
+	g_return_if_fail (subject != NULL);
+	g_return_if_fail (predicate != NULL);
+	g_return_if_fail (object != NULL);
+
 	tracker_data_begin_transaction ();
 
 	subject_id = query_resource_id (subject);