[Bug 719733] tests: fix memory leak, free test's thread pool

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=719733
  GStreamer | gst-rtsp-server | git

--- Comment #1 from Sebastian Rasmussen <sebras at hotmail.com> 2013-12-02 23:38:22 UTC ---
Created an attachment (id=263351)
 View: https://bugzilla.gnome.org/attachment.cgi?id=263351
 Review: https://bugzilla.gnome.org/review?bug=719733&attachment=263351

Proposed patch plugging memory leak in unit test

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