[Bug 766455] nlecomposition: ensure elements pending to be added are not leaked

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=766455

--- Comment #2 from Aurélien Zanelli <aurelien.zanelli at parrot.com> ---
Created attachment 327900
  --> https://bugzilla.gnome.org/attachment.cgi?id=327900&action=edit
[2/2] nlecomposition: ensure elements pending to be added are not leaked

Patch proposal to fix the leak.

THe idea is to have each stage hold a reference on the element to be added and
release it when stage is done.

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