[Bug 747602] basetextoverlay: Leak in gst_base_text_overlay_text_chain

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=747602

--- Comment #1 from Guillaume Desmottes <gdesmott at gnome.org> ---
Created attachment 301256
  --> https://bugzilla.gnome.org/attachment.cgi?id=301256&action=edit
basetextoverlay: fix buffer leak in chain function

If we don't consume the buffer by passing its reference to
overlay->text_buffer then we need to unref it.

Fix a leak with validate.file.playback.fast_forward.test5_mkv when running
inside Valgrind.

https://bugzilla.gnome.org/show_bug.cgi?id=747602

Signed-off-by: Guillaume Desmottes <guillaume.desmottes at collabora.co.uk>

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