[Bug 722556] pad: Cleanup hooks on dispose

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=722556
  GStreamer | gstreamer (core) | git

--- Comment #3 from Andrey Utkin <me at andrey-utkin.pp.ua> 2014-01-20 14:56:30 UTC ---
(In reply to comment #2)
> What exactly is the problem here though? No memory should be leaked without
> your patch either, and the pad should be unblocked already when it is disposed.

I haven't checked a lot with exact testcases (BTW if you have already made
some, please share), but i think it fixes the situation when pad is going to be
disposed, and hooks are still there (yes, that's application level error). No?

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