[Bug 766449] ges: fix various leaks with usage of ges_timeline_element_lookup_child

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=766449

--- Comment #1 from Aurélien Zanelli <aurelien.zanelli at parrot.com> ---
Created attachment 327893
  --> https://bugzilla.gnome.org/attachment.cgi?id=327893&action=edit
ges: fix various leaks with usage of ges_timeline_element_lookup_child

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