decoder: Fix memory uninitialized issue in ihevcd_sao_shift_ctb

Test: poc in bug
Bug: 158484516

Change-Id: I83e89056be52b96760d95f5826c2bfdcfd3962e2
(cherry picked from commit dcef8335b71f8a6dc50bbb2b02ed99a4cf44577a)
1 file changed