Fix potential overflow in Visualizer effect am: 7bbd500874 am: 99589ed96f am: 8682da681a am: a5dddadec9 am: 960cba3e1b am: 902b06895f am: af1e40957a am: e1bc1ac318 am: 0fafbe88b5 am: 453066787b am: 1414a77d6a am: 48309eb29c
am: b0b84bc962

Change-Id: I042fd15d5349c48f7c5aa9a97d31dc66c9380b93