[Bug 696542] tests: remove extra unref in test_setup_non_existing_stream

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=696542
  GStreamer | gst-rtsp-server | git

Tim-Philipp Müller <t.i.m> changed:

           What    |Removed                     |Added
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 Attachment #239737|none                        |committed
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