chown: Add crate walkdir

src/chown/Cargo.toml

@@ -12,7 +12,7 @@ getopts = "*"
 glob = "*"
 libc = "*"
 uucore = { path="../uucore" }
-clippy = {version = "*", optional = true}
+walkdir = "0.1"
 
 [[bin]]
 name = "chown"

src/chown/passwd.rs

@@ -18,6 +18,7 @@ macro_rules! gen_func {
                 if !data.is_null() {
                     return Ok(id);
                 } else {
+                    // last_os_error() returns success
                     return Err(Error::new(ErrorKind::NotFound, format!("No such id `{}`", id)));
                 }
             } else {
@@ -30,6 +31,7 @@ macro_rules! gen_func {
                         ptr::read(data).$field
                     });
                 } else {
+                    // last_os_error() returns success
                     return Err(Error::new(ErrorKind::NotFound, format!("No such name `{}`", name_or_id)));
                 }
             }