avcodec/truemotion1: Fix undefined behavior (left shift of negative value)
Fixes: asan_heap-oob_26f6853_862_cov_585961513_sonic3dblast_intro-partial.avi
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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