Fix potential overflow in Visualizer effect am: 7bbd500874 am: 99589ed96f am: 8682da681a am: a5dddadec9 am: 960cba3e1b am: 902b06895f am: af1e40957a am: e1bc1ac318
am: 0fafbe88b5

Change-Id: I6cdeb5b4234c5e6fcb2882ab7a778fa0894a28ed