[Bug 771648] subtitle not work when play rate is negative

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=771648

--- Comment #3 from Haihua Hu <jared.hu at nxp.com> ---
Created attachment 348970
  --> https://bugzilla.gnome.org/attachment.cgi?id=348970&action=edit
subparse: fix critical log print out when set rate <0 with external subtitle

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