[gnome-boxes] selectionbar: Fix printf format string

[Jürg Billeter <juergbi src gnome org>]

commit 8e4828661cabd8389dc9ba86baa97f2e0c8a58ba
Author: Jürg Billeter <j bitron ch>
Date:   Tue Nov 1 20:00:34 2016 +0100

    selectionbar: Fix printf format string

 src/selectionbar.vala |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/selectionbar.vala b/src/selectionbar.vala
index e7440e6..845abce 100644
--- a/src/selectionbar.vala
+++ b/src/selectionbar.vala
@@ -172,6 +172,6 @@ private class Boxes.Selectionbar: Gtk.Revealer {
         if (items == 0)
             open_btn.label = C_("0 items selected", "_Open in new window");
         else
-            open_btn.label = ngettext ("_Open in new window", "_Open in %d new windows", items).printf 
(items);
+            open_btn.label = ngettext ("_Open in new window", "_Open in %u new windows", items).printf 
(items);
     }
 }