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

Change-Id: I8251d348061bb03fc1b86ede1002586b0eff4e0c