also fix linux

Author: MikailBag

src/linux.rs

@@ -58,7 +58,7 @@ impl ChildProcess for LinuxChildProcess {
     type PipeIn = LinuxWritePipe;
     type PipeOut = LinuxReadPipe;
     fn get_exit_code(&self) -> Result<Option<i64>, Error> {
-        self.wait_for_exit(Duration::from_millis(1))?;
+        self.wait_for_exit(Some(Duration::from_millis(1)))?;
         let ec = self.exit_code.load(Ordering::SeqCst);
         let ec = match ec {
             EXIT_CODE_STILL_RUNNING => None,
@@ -94,7 +94,7 @@ impl ChildProcess for LinuxChildProcess {
     }
 
     fn is_finished(&self) -> bool {
-        Ok(self.exit_code.load(Ordering::SeqCst) != EXIT_CODE_STILL_RUNNING)
+        self.exit_code.load(Ordering::SeqCst) != EXIT_CODE_STILL_RUNNING
     }
 }