remove unnecessary mut ref

Signed-off-by: hi-rustin <rustin.liu@gmail.com>

Author: 0xPoe

src/dist/component/package.rs

@@ -349,15 +349,15 @@ fn unpack_without_first_dir<'a, R: Read>(
         /// has been fully dispatched.
         fn flush_ios<'a, R: std::io::Read, P: AsRef<Path>>(
             io_executor: &mut dyn Executor,
-            mut directories: &mut HashMap<PathBuf, DirStatus>,
+            directories: &mut HashMap<PathBuf, DirStatus>,
             mut sender_entry: Option<&mut SenderEntry<'a, '_, R>>,
             full_path: P,
         ) -> Result<bool> {
             let mut result = sender_entry.is_none();
             for mut op in io_executor.completed().collect::<Vec<_>>() {
                 // TODO capture metrics
                 filter_result(&mut op)?;
-                trigger_children(&*io_executor, &mut directories, op)?;
+                trigger_children(&*io_executor, directories, op)?;
             }
             // Maybe stream a file incrementally
             if let Some(sender) = sender_entry.as_mut() {