avformat/webvttdec: Fix memleak upon read header failure
The already parsed subtitles (contained in an FFDemuxSubtitlesQueue)
would leak if an error happened upon reading a subsequent subtitle.
Signed-off-by:
Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
(cherry picked from commit c784fe8b867e42a1c8d2c48d7046e3e0cce7ec31)
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