[Bug 647293] Fix pad callbacks so they handle when parent goes away

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=647293
  GStreamer | gstreamer (core) | 0.10.x

--- Comment #2 from Haakon Sporsheim <haakon.sporsheim at gmail.com> 2011-04-09 19:18:20 UTC ---
Would be nice to get it in, since a couple of similar fixes got in a couple of
days ago.

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