[Bug 708789] playbin: make sure elements are in null before disposing

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=708789
  GStreamer | gst-plugins-base | unspecified

--- Comment #1 from Thiago Sousa Santos <thiago.sousa.santos at collabora.co.uk> 2013-09-25 22:39:10 UTC ---
Created an attachment (id=255729)
 View: https://bugzilla.gnome.org/attachment.cgi?id=255729
 Review: https://bugzilla.gnome.org/review?bug=708789&attachment=255729

playbin: make sure elements are in null before disposing

If a pipeline fails to preroll, it might happen that the sinks are
put into READY state from playbin's sink activation, but they are never
set to playsink, so they aren't being managed by a GstBin and will keep
their READY state until they are unreffed, leading to a warning.

Prevent this by always forcing them to NULL when deactivating a group

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