Fixes: undefined behavior
Fixes: 702974
Found-by: Thomas Guilbert <tguilbert@google.com>
Reviewed-by: Rostislav Pehlivanov <atomnuker@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 23ae3cc8)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>