message: Fix cfg flags for benchmarking.
diff: @@ -134,10 +134,10 @@ impl ImageError {
  #[cfg(test)]
  mod tests {
  - #![cfg(feature = "benchmarks")]
  extern crate test;
  use super::cmyk_to_rgb;
  + #[cfg(feature = "benchmarks")]
  use test::Bencher;
  const W: usize = 256;
  