[empathy] filter_result_callback_data_new: add some checks

[Guillaume Desmottes <gdesmott src gnome org>]

commit 22da56b2392a9470f50c1da6b54f8e5aebf7ac4a
Author: Guillaume Desmottes <guillaume desmottes collabora co uk>
Date:   Mon Jan 16 10:37:26 2012 +0100

    filter_result_callback_data_new: add some checks

 libempathy-gtk/empathy-account-chooser.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/libempathy-gtk/empathy-account-chooser.c b/libempathy-gtk/empathy-account-chooser.c
index c21a22e..ae3f1dd 100644
--- a/libempathy-gtk/empathy-account-chooser.c
+++ b/libempathy-gtk/empathy-account-chooser.c
@@ -90,6 +90,10 @@ filter_result_callback_data_new (EmpathyAccountChooser *self,
 {
   FilterResultCallbackData *data;
 
+  g_return_val_if_fail (self != NULL, NULL);
+  g_return_val_if_fail (account != NULL, NULL);
+  g_return_val_if_fail (iter != NULL, NULL);
+
   data = g_slice_new0 (FilterResultCallbackData);
   data->self = g_object_ref (self);
   data->account = g_object_ref (account);