[Bug 754661] harness: Fix race for gst_harness_element_ref

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=754661

--- Comment #1 from Stian Selnes (stianse) <stian.selnes at gmail.com> ---
Created attachment 310785
  --> https://bugzilla.gnome.org/attachment.cgi?id=310785&action=edit
harness: Allow-none for custom stress init func

It should be allowed to not have a function to initialize the user data
since it's often not necessary; it may already be initialized.

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