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 am: 0710743c91 am: 53bc7fcee3
am: a0cc369cbc

Change-Id: I24c684d2c161100a2a29b4bafc6cfd63a51a39e3