[Bug 739640] tests : fix leaks in adder unit test

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=739640
  GStreamer | gst-plugins-base | git

Danny Song <danny.song.ga> changed:

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--- Comment #3 from Danny Song <danny.song.ga at gmail.com> 2014-11-05 17:23:22 UTC ---
Created an attachment (id=290040)
 View: https://bugzilla.gnome.org/attachment.cgi?id=290040
 Review: https://bugzilla.gnome.org/review?bug=739640&attachment=290040

fix leaks and remove unnecessary gst_event_ref in  adder unit test

Thanks for your review.
You're talking about test_play_twice,right?:) 
Agree, gst_element_send_event doesn't have to use _ref() because it doesn't
reuse after the call.

And I changed my name.

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