avformat/mpsubdec: Fix memleak upon read header failure
The already parsed subtitles (contained in an FFDemuxSubtitlesQueue)
would leak if an error happened upon creating an AVStream.
Signed-off-by:
Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
(cherry picked from commit a5ed8aeea4f4199e89520c3fdbd9d07ae7fc3c3f)
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