[Bug 796935] parsebin: Add missing locks/unlocks of the chain mutex

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796935

--- Comment #1 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
Created attachment 373288
  --> https://bugzilla.gnome.org/attachment.cgi?id=373288&action=edit
parsebin: Add missing locks/unlocks of the chain mutex

Before freeing pending pads it is required to hold the mutex, that's
what is protecting the list of pending pads in other places.

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