Fix clippy warnings

src/benchmark/executor.rs

@@ -62,7 +62,7 @@ impl<'a> Executor for ShellExecutor<'a> {
         };
 
         let wallclock_timer = WallClockTimer::start();
-        let result = execute_and_time(stdout, stderr, &command.get_shell_command(), &self.shell)?;
+        let result = execute_and_time(stdout, stderr, &command.get_shell_command(), self.shell)?;
         let mut time_real = wallclock_timer.stop();
 
         let mut time_user = result.user_time;

src/benchmark/scheduler.rs

@@ -34,7 +34,7 @@ impl<'a> Scheduler<'a> {
     pub fn run_benchmarks(&mut self) -> Result<()> {
         let mut executor: Box<dyn Executor> = match self.options.executor_kind {
             ExecutorKind::Mock(ref shell) => Box::new(MockExecutor::new(shell.clone())),
-            ExecutorKind::Shell(ref shell) => Box::new(ShellExecutor::new(shell, &self.options)),
+            ExecutorKind::Shell(ref shell) => Box::new(ShellExecutor::new(shell, self.options)),
         };
 
         executor.calibrate()?;