[Bug 646566] Protect against Pad-Parent disappearing

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=646566
  GStreamer | gstreamer (core) | git

--- Comment #24 from Tim-Philipp Müller <t.i.m at zen.co.uk> 2011-04-09 17:42:22 UTC ---
> I thought queue = GST_QUEUE (NULL); was legal?

You are right, my apologies. I could've sworn this was not allowed, because I
remember warnings about invalid casts of pointer 'NULL" to type xyz. But
according to the code in gtype.[ch] this is just fine. Wonder if it changed at
some point. In any case, sorry for the noise.

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