[rygel] tracker: Fix New container date check

[Jens Georg <jensgeorg src gnome org>]

commit 01d6fc159cfc323d8c92fb811afb0adb1513038d
Author: Jens Georg <mail jensge org>
Date:   Sun May 31 16:51:19 2020 +0200

    tracker: Fix New container date check

 src/plugins/tracker/rygel-tracker-new.vala | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/plugins/tracker/rygel-tracker-new.vala b/src/plugins/tracker/rygel-tracker-new.vala
index efabcc86..ce5d40dd 100644
--- a/src/plugins/tracker/rygel-tracker-new.vala
+++ b/src/plugins/tracker/rygel-tracker-new.vala
@@ -42,7 +42,7 @@ public class Rygel.Tracker.New : Rygel.Tracker.SearchContainer {
                                         ADDED_VARIABLE));
 
         var now = new DateTime.now_utc ();
-        now.add_days (-3);
+        now = now.add_days (-3);
         var three_days_ago = "%sZ".printf (now.format ("%Y-%m-%dT%H:%M:%S"));
 
         var filters = new ArrayList<string> ();