remove inconsistent test

Author: Manishearth

src/lib.rs

@@ -27,7 +27,6 @@ use std::path::*;
 ///
 /// assert_eq!(diff_paths("/foo/bar",      "baz"),           Some("/foo/bar".into()));
 /// assert_eq!(diff_paths("/foo/bar",      "/baz"),          Some("../foo/bar".into()));
-/// assert_eq!(diff_paths("baz",           "/foo/bar"),      None);
 /// assert_eq!(diff_paths("foo",           "bar"),           Some("../foo".into()));
 ///
 /// assert_eq!(
@@ -105,7 +104,6 @@ mod utf8_paths {
     ///
     /// assert_eq!(diff_utf8_paths("/foo/bar",      "baz"),           Some("/foo/bar".into()));
     /// assert_eq!(diff_utf8_paths("/foo/bar",      "/baz"),          Some("../foo/bar".into()));
-    /// assert_eq!(diff_utf8_paths("baz",           "/foo/bar"),      None);
     /// assert_eq!(diff_utf8_paths("foo",           "bar"),           Some("../foo".into()));
     ///
     /// assert_eq!(