typefind: fix leak in gst_type_find_element_src_event()
typefind: fix leak in gst_type_find_element_src_event()

gst_type_find_element_src_event() is supposed to consume @event but wasn't
doing so when it was handling the event itself.

https://bugzilla.gnome.org/show_bug.cgi?id=747775

Signed-off-by: Guillaume Desmottes <f16649c7afcd84e3350287183c4ed23cb1aea57c@collabora.co.uk>

krichter722/gstreamer,shelsonjava/gstreamer,centricular/gstreamer,StreamUtils/gstreamer,krichter722/gstreamer,shelsonjava/gstreamer,mparis/gstreamer,jpxiong/gstreamer,StreamUtils/gstreamer,centricular/gstreamer,jpxiong/gstreamer,krichter722/gstreamer,StreamUtils/gstreamer,mparis/gstreamer,mparis/gstreamer,centricular/gstreamer,mparis/gstreamer,krichter722/gstreamer,shelsonjava/gstreamer,centricular/gstreamer,jpxiong/gstreamer,centricular/gstreamer,StreamUtils/gstreamer,krichter722/gstreamer,StreamUtils/gstreamer,jpxiong/gstreamer,shelsonjava/gstreamer,jpxiong/gstreamer,mparis/gstreamer,shelsonjava/gstreamer