[Bug 781017] gstaggregator: fix event use after free

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=781017

--- Comment #6 from Vincent Penquerc'h <vincent.penquerch at collabora.co.uk> ---
This version just looks what it needs before calling sink_event, and thus does
not need to retain a ref for after the call.

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