[Bug 734359] tests: Add missing unrefs of objects after use

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=734359
  GStreamer | gst-plugins-base | git

--- Comment #1 from Sebastian Rasmussen <sebras at hotmail.com> 2014-08-06 13:10:53 UTC ---
Created an attachment (id=282698)
 View: https://bugzilla.gnome.org/attachment.cgi?id=282698
 Review: https://bugzilla.gnome.org/review?bug=734359&attachment=282698

Proposed patch adding omitted unrefs.

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