[glib] g_settings_bind: add some g_return checks

[Ryan Lortie <ryanl src gnome org>]

commit 2b0171a8080c233f85c1d66fa6df6d75640b37e5
Author: Ryan Lortie <desrt desrt ca>
Date:   Mon Aug 15 10:42:35 2011 -0400

    g_settings_bind: add some g_return checks
    
    https://bugzilla.gnome.org/show_bug.cgi?id=636405

 gio/gsettings.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/gio/gsettings.c b/gio/gsettings.c
index 399f4d2..f9e476b 100644
--- a/gio/gsettings.c
+++ b/gio/gsettings.c
@@ -2787,6 +2787,9 @@ g_settings_bind_with_mapping (GSettings               *settings,
   GQuark binding_quark;
 
   g_return_if_fail (G_IS_SETTINGS (settings));
+  g_return_if_fail (key != NULL);
+  g_return_if_fail (G_IS_OBJECT (object));
+  g_return_if_fail (property != NULL);
   g_return_if_fail (~flags & G_SETTINGS_BIND_INVERT_BOOLEAN);
 
   objectclass = G_OBJECT_GET_CLASS (object);