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dec_sub: fix locking for sub_ass_get_extradata

sub->sd can be destroyed and recreated when update_segment is called
inside a lock.

Fixes: f9918b53901db2fbc3cfc1be509a32d3ed89556a
N
nanahi committed
715feea8d82a750c3d627ee10c4fd6c6fe1fbe86
Parent: dbe3776
Committed by Kacper Michajłow <kasper93@gmail.com> on 4/17/2024, 9:42:35 PM