[gnome-boxes] libvirt-machine-properties: add_*_property() return Property

[Zeeshan Ali Khattak <zeeshanak src gnome org>]

commit 43884e19f8881a4dc88bf50c2d0cffab377051f3
Author: Zeeshan Ali (Khattak) <zeeshanak gnome org>
Date:   Wed Feb 6 00:50:59 2013 +0200

    libvirt-machine-properties: add_*_property() return Property
    
    add_*_property() methods now return ref to the property they add.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=688333

 src/libvirt-machine-properties.vala |   15 +++++++++++----
 1 files changed, 11 insertions(+), 4 deletions(-)
---
diff --git a/src/libvirt-machine-properties.vala b/src/libvirt-machine-properties.vala
index 995cc6c..1cd00c3 100644
--- a/src/libvirt-machine-properties.vala
+++ b/src/libvirt-machine-properties.vala
@@ -347,7 +347,7 @@ private class Boxes.LibvirtMachineProperties: GLib.Object, Boxes.IPropertiesProv
         } catch (GLib.Error e) {}
     }
 
-    private void add_ram_property (ref List<Boxes.Property> list) {
+    private SizeProperty? add_ram_property (ref List<Boxes.Property> list) {
         try {
             var max_ram = machine.connection.get_node_info ().memory;
 
@@ -365,7 +365,11 @@ private class Boxes.LibvirtMachineProperties: GLib.Object, Boxes.IPropertiesProv
             });
 
             update_ram_property (property);
-        } catch (GLib.Error error) {}
+
+            return property;
+        } catch (GLib.Error error) {
+            return null;
+        }
     }
 
     private void on_ram_changed (Boxes.Property property, uint64 value) {
@@ -448,9 +452,9 @@ private class Boxes.LibvirtMachineProperties: GLib.Object, Boxes.IPropertiesProv
         App.app.notificationbar.display_for_action (message, Gtk.Stock.YES, (owned) reboot);
     }
 
-    private void add_storage_property (ref List<Boxes.Property> list) {
+    private SizeProperty? add_storage_property (ref List<Boxes.Property> list) {
         if (machine.storage_volume == null)
-            return;
+            return null;
 
         try {
             var volume_info = machine.storage_volume.get_info ();
@@ -465,10 +469,13 @@ private class Boxes.LibvirtMachineProperties: GLib.Object, Boxes.IPropertiesProv
                                               max_storage,
                                               256 * Osinfo.MEBIBYTES);
             property.changed.connect (on_storage_changed);
+
+            return property;
         } catch (GLib.Error error) {
             warning ("Failed to get information on volume '%s' or it's parent pool: %s",
                      machine.storage_volume.get_name (),
                      error.message);
+            return null;
         }
     }