message: Fix some minor clippy warnings
diff: @@ -43,7 +43,7 @@ pub fn summarize(id: &str, criterion: &Criterion) {
  pub fn function<F>(id: &str, f: F, criterion: &Criterion) where F: FnMut(&mut Bencher) {
  common(id, &mut Function(f), criterion);
  - println!("");
  + println!();
  }
  pub fn functions<I>(id: &str,
  @@ -82,7 +82,7 @@ pub fn function_over_inputs<I, F>(
  pub fn program(id: &str, prog: &mut Command, criterion: &Criterion) {
  common(id, &mut Program::spawn(prog), criterion);
  - println!("");
  + println!();
  }
  pub fn program_over_inputs<I, F>(
  