[tracker] tracker-needle: Fix build

[Carlos Garnacho <carlosg src gnome org>]

commit d7019161cdf9eb141293792bbba0ccfe46600ed1
Author: Carlos Garnacho <carlosg gnome org>
Date:   Sat Nov 19 23:31:28 2016 +0100

    tracker-needle: Fix build
    
    It seems recent vala got pickier with passing unsigned to a %d
    parameter. It's still right nonetheless, and changing the string
    is a needless translation change, so just cast to int.

 src/tracker-needle/tracker-tags-view.vala |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/tracker-needle/tracker-tags-view.vala b/src/tracker-needle/tracker-tags-view.vala
index b9eb25d..4ecffb9 100644
--- a/src/tracker-needle/tracker-tags-view.vala
+++ b/src/tracker-needle/tracker-tags-view.vala
@@ -373,7 +373,7 @@ public class TrackerTagsView : Box {
                        string str = dngettext (null,
                                                "_Set the tags you want to associate with the %d selected 
item:",
                                                "_Set the tags you want to associate with the %d selected 
items:",
-                                               files.length ()).printf (files.length ());
+                                               files.length ()).printf ((int) files.length ());
                        label.set_text_with_mnemonic (str);
                        vbox.sensitive = true;
                } else {