demux: avi: check subindex, fix potential invalid deref
Reported by: Zhen Zhou, NSFOCUS Security Team Signed-off-by: Hugo Beauzée-Luyssen <hugo@beauzee.fr> (cherry picked from commit 072c3bf621f34efbc81048bd5db585f554b9d1b0) Signed-off-by: Hugo Beauzée-Luyssen <hugo@beauzee.fr>
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