[Bug 774854] validate: Deadlock in queue2 when seeking on a dash stream

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=774854

--- Comment #1 from Thibault Saunier <tsaunier at gnome.org> ---
Created attachment 340549
  --> https://bugzilla.gnome.org/attachment.cgi?id=340549&action=edit
queue2: Unblock any ongoing serialize query when shuting down

In case we have a serialize query happening when going from PAUSED
to READY after the srcpad task was stop and the moment we deactivate
the sinkpad, we need to make sure we wake up the stuck sinkpad streaming
thread to be able to get the sinkpad stream lock.

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