[gitg] Fix build with Vala 0.25.2

[Jürg Billeter <juergbi src gnome org>]

commit 3cc32689f609a28b69244270373407956e7f601f
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Thu Aug 28 21:20:21 2014 +0200

    Fix build with Vala 0.25.2

 gitg/gitg-clone-dialog.vala |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gitg/gitg-clone-dialog.vala b/gitg/gitg-clone-dialog.vala
index 365d355..94eb610 100644
--- a/gitg/gitg-clone-dialog.vala
+++ b/gitg/gitg-clone-dialog.vala
@@ -42,7 +42,7 @@ public class CloneDialog : Gtk.Dialog
 
        public File location
        {
-               get { return d_button_location.get_file(); }
+               owned get { return d_button_location.get_file(); }
        }
 
        public string url