[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 #2 from Aurélien Zanelli <aurelien.zanelli at parrot.com> ---
(In reply to Aurélien Zanelli from comment #1)
> Created attachment 327893 [details] [review]
> ges: fix various leaks with usage of ges_timeline_element_lookup_child

I found that this patch causes or reveals an issue when disposing of
GstFramePositioner with video track. I will try to look at it tomorrow, if no
one is quicker than me :)

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