[Bug 767413] tee: Properly handle return value when only 1 pad

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=767413

--- Comment #5 from Xavier Claessens <xclaesse at gmail.com> ---
Tim: the nice trick here is we can remove a "branch" from a tee without idle
pad probe:

  gst_element_release_request_pad (tee, pad);
  gst_bin_remove (parent, sink);
  gst_element_set_state (sink, GST_STATE_NULL);

That sequence is safe (with the patch attached here), because if a buffer was
in the sink element, setting its state to NULL will return GST_FLOW_FLUSHING,
but since the pad was already removed from the tee, that return value is
ignored and GST_FLOW_OK (or GST_FLOW_UNLINKED if that was last pad and
allow-not-linked==FALSE) is propagated to the source.

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