Fix potential overflow in Visualizer effect Bug: 30229821 Change-Id: Ia07041a5a149d7d3e120aa6ea0345fb86da37c9b (cherry picked from commit b61dd321d08b21a5629044eca7f96e2ecd348e5f) (cherry picked from commit 7bbd5008747431d42e2f8cfbc0ddcb8465cdb4a5)