[empathy] Check for NULL values returned by dup_selected()

[Sjoerd Simons <sjoerds src gnome org>]

commit aee5f035ce319f43a541bcf0cbdc536d648192eb
Author: Cosimo Cecchi <cosimoc gnome org>
Date:   Tue Aug 25 02:50:53 2009 +0200

    Check for NULL values returned by dup_selected()

 src/empathy-accounts-dialog.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)
---
diff --git a/src/empathy-accounts-dialog.c b/src/empathy-accounts-dialog.c
index 40f46e4..b2378b7 100644
--- a/src/empathy-accounts-dialog.c
+++ b/src/empathy-accounts-dialog.c
@@ -290,6 +290,15 @@ accounts_dialog_protocol_changed_cb (GtkWidget *widget,
   cm = empathy_protocol_chooser_dup_selected (
       EMPATHY_PROTOCOL_CHOOSER (priv->combobox_protocol), &proto);
 
+  if (cm == NULL)
+    return;
+
+  if (proto == NULL)
+    {
+      g_object_unref (cm);
+      return;
+    }
+
   if (tp_connection_manager_protocol_can_register (proto))
     {
       gtk_widget_show (priv->radiobutton_register);