[tracker] tracker-store: Fix possible memory corruption

[Philip Van Hoof <pvanhoof src gnome org>]

commit a6de795033d7502342e0f239c0dfd02052e50ef4
Author: Philip Van Hoof <philip codeminded be>
Date:   Mon May 3 11:03:01 2010 +0200

    tracker-store: Fix possible memory corruption

 src/tracker-store/tracker-resources.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/src/tracker-store/tracker-resources.c b/src/tracker-store/tracker-resources.c
index 274fb29..76a14c3 100644
--- a/src/tracker-store/tracker-resources.c
+++ b/src/tracker-store/tracker-resources.c
@@ -234,7 +234,8 @@ query_callback (gpointer inthread_data, GError *error, gpointer user_data)
 		dbus_g_method_send_reply (info->context, ptr->reply);
 	}
 
-	g_slice_free (InThreadPtr, ptr);
+	if (ptr)
+		g_slice_free (InThreadPtr, ptr);
 }
 
 static gpointer