[Bug 752651] decodebin: segfault on setting to NULL

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=752651

--- Comment #26 from Vincent Penquerc'h <vincent.penquerch at collabora.co.uk> ---
Created attachment 310031
  --> https://bugzilla.gnome.org/attachment.cgi?id=310031&action=edit
fix deadlock in discoverer

This fixes that issue.
gst-validate-launcher has failures, but they also happen after a test run with
the patches in the bug removed.

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