[gnome-boxes] Remove deprecated str.len () usage

[Marc-Andre Lureau <malureau src gnome org>]

commit 8315d99d73b5b0422fc2915810e6b23b0564f984
Author: Marc-Andrà Lureau <marcandre lureau gmail com>
Date:   Thu Nov 3 13:09:05 2011 +0100

    Remove deprecated str.len () usage

 src/wizard.vala |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/wizard.vala b/src/wizard.vala
index 868b1d2..6bae45c 100644
--- a/src/wizard.vala
+++ b/src/wizard.vala
@@ -96,7 +96,7 @@ private class Boxes.Wizard: Boxes.UI {
         });
         wizard_source.url_entry.changed.connect (() => {
             // FIXME: add uri checker
-            next_button.sensitive = wizard_source.uri.len () != 0;
+            next_button.sensitive = wizard_source.uri.length != 0;
         });
     }