[folks] tracker: Fix assignment of owned value to unowned variable

[Philip Withnall <pwithnall src gnome org>]

commit 4603e7796b9b6a9e98c1931e290e538f9e1d46e5
Author: Philip Withnall <philip withnall collabora co uk>
Date:   Tue Sep 20 14:00:10 2016 -0700

    tracker: Fix assignment of owned value to unowned variable
    
    Vala has (rightfully) got more strict about this. This should work with
    older Vala releases too.

 backends/tracker/lib/trf-util.vala |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/backends/tracker/lib/trf-util.vala b/backends/tracker/lib/trf-util.vala
index 53d48e6..9b10cb3 100644
--- a/backends/tracker/lib/trf-util.vala
+++ b/backends/tracker/lib/trf-util.vala
@@ -72,7 +72,7 @@ internal class Trf.AfflInfo : Object
     {
       string ret = " { ";
       bool first = true;
-      unowned ParamSpec[] properties = this.get_class ().list_properties ();
+      var properties = this.get_class ().list_properties ();
 
       foreach (unowned ParamSpec pspec in properties)
         {