[rygel] Changed _ to ngettext for 1 message

[Marek Černocký <mcernocky src gnome org>]

commit c8896b4c1c7c4c0b4b26009946bf43510a11d44b
Author: Marek Černocký <marek manet cz>
Date:   Sat Jul 25 12:42:09 2015 +0200

    Changed _ to ngettext for 1 message

 .../rygel-media-export-item-factory.vala           |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/src/plugins/media-export/rygel-media-export-item-factory.vala 
b/src/plugins/media-export/rygel-media-export-item-factory.vala
index 4e1b1d2..e133309 100644
--- a/src/plugins/media-export/rygel-media-export-item-factory.vala
+++ b/src/plugins/media-export/rygel-media-export-item-factory.vala
@@ -133,7 +133,9 @@ namespace Rygel.MediaExport.ItemFactory {
 
         var it = v.iterator ();
         if (it.n_children () != 7) {
-            warning (_("Invalid metadata serialisation: expected 7 children, got %d"),
+            warning (ngettext("Invalid metadata serialisation: expected 7 children, got %d",
+                              "Invalid metadata serialisation: expected 7 children, got %d",
+                              (int) it.n_children ()),
                      (int) it.n_children ());
 
             return null;