[gnome-control-center] network: Prevent a crash when a device is removed and then re-added

[Richard Hughes <rhughes src gnome org>]

commit 08532a3a86e2a8ee6621c857281cf9a06bc77545
Author: Richard Hughes <richard hughsie com>
Date:   Mon Jul 23 10:14:31 2012 +0100

    network: Prevent a crash when a device is removed and then re-added

 panels/network/net-device.c |   17 +++++++++++++----
 1 files changed, 13 insertions(+), 4 deletions(-)
---
diff --git a/panels/network/net-device.c b/panels/network/net-device.c
index 5f01410..c53c909 100644
--- a/panels/network/net-device.c
+++ b/panels/network/net-device.c
@@ -40,6 +40,7 @@
 struct _NetDevicePrivate
 {
         NMDevice                        *nm_device;
+        guint                            changed_id;
 };
 
 enum {
@@ -281,11 +282,15 @@ net_device_set_property (GObject *device_,
 
         switch (prop_id) {
         case PROP_DEVICE:
+                if (priv->changed_id != 0) {
+                        g_signal_handler_disconnect (priv->nm_device,
+                                                     priv->changed_id);
+                }
                 priv->nm_device = g_value_dup_object (value);
-                g_signal_connect (priv->nm_device,
-                                  "state-changed",
-                                  G_CALLBACK (state_changed_cb),
-                                  net_device);
+                priv->changed_id = g_signal_connect (priv->nm_device,
+                                                     "state-changed",
+                                                     G_CALLBACK (state_changed_cb),
+                                                     net_device);
                 break;
         default:
                 G_OBJECT_WARN_INVALID_PROPERTY_ID (net_device, prop_id, pspec);
@@ -299,6 +304,10 @@ net_device_finalize (GObject *object)
         NetDevice *device = NET_DEVICE (object);
         NetDevicePrivate *priv = device->priv;
 
+        if (priv->changed_id != 0) {
+                g_signal_handler_disconnect (priv->nm_device,
+                                             priv->changed_id);
+        }
         if (priv->nm_device != NULL)
                 g_object_unref (priv->nm_device);