[gnome-contacts] Fix warning about uninitialized out param

[Alexander Larsson <alexl src gnome org>]

commit c6f7e49b12e6b05eb03a66fb6695d7277360ddea
Author: Alexander Larsson <alexl redhat com>
Date:   Mon Sep 19 14:33:07 2011 +0200

    Fix warning about uninitialized out param

 src/contacts-contact.vala |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/contacts-contact.vala b/src/contacts-contact.vala
index a3d61fe..12f26f5 100644
--- a/src/contacts-contact.vala
+++ b/src/contacts-contact.vala
@@ -193,6 +193,7 @@ public class Contacts.Contact : GLib.Object  {
       }
     }
 
+    sources = null;
     return null;
   }