Replace redundant function:

applications/cd/src/lib.rs

@@ -38,7 +38,7 @@ pub fn main(args: Vec<String>) -> isize {
     } else {
         let path = matches.free[0].as_ref();
 
-        match curr_env.lock().chdir_path(path) {
+        match curr_env.lock().chdir(path) {
             Err(environment::Error::NotADirectory) => {
                 println!("not a directory: {}", path);
                 return -1;

kernel/environment/src/lib.rs

@@ -31,20 +31,6 @@ impl Environment {
     /// Changes the current working directory.
     #[doc(alias("change"))]
     pub fn chdir(&mut self, path: &Path) -> Result<()> {
-        for component in path.components() {
-            let new = self.working_dir.lock().get(component.as_ref());
-            match new {
-                Some(FileOrDir::Dir(dir)) => {
-                    self.working_dir = dir;
-                }
-                Some(FileOrDir::File(_)) => return Err(Error::NotADirectory),
-                None => return Err(Error::NotFound),
-            }
-        }
-        Ok(())
-    }
-
-    pub fn chdir_path(&mut self, path: &Path) -> Result<()> {
         match path.get(&self.working_dir) {
             Some(FileOrDir::Dir(dir)) => {
                 self.working_dir = dir;