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

Change-Id: I07a32d9ac52c01603bfed43768d26debb1db2b2f