Fix potential overflow in Visualizer effect am: 46dc714d52 am: 8720f85196 am: bad0250dcb am: 2feb9ce748 am: fba2bd1372 am: dddfa37ec9 am: de6acc18bb am: a0f7a7b07e am: dd6ad5eba7
am: be0844b573

Change-Id: I2b756489d87fdca61c681b8e02ace1b274dc942f