am 7e480eaf: WallPaper: Fix the length of FFT results returned by Visualizer.

Merge commit '7e480eafd5f647d9d15878dc11eec2b1dc401eda'

* commit '7e480eafd5f647d9d15878dc11eec2b1dc401eda':
  WallPaper: Fix the length of FFT results returned by Visualizer.