use NotADirectory io error kind where appropriate

gix-fs/tests/dir/remove.rs

@@ -34,7 +34,10 @@ mod empty_upwards_until_boundary {
         let dir = tempfile::tempdir()?;
         let target = dir.path().join("actually-a-file");
         std::fs::write(&target, [42])?;
-        assert!(remove::empty_upward_until_boundary(&target, dir.path()).is_err()); // TODO: check for IsNotADirectory when it becomes stable
+
+        let res = remove::empty_upward_until_boundary(&target, dir.path());
+        assert!(res.is_err());
+        assert!(res.err().unwrap().kind() == io::ErrorKind::NotADirectory);
         assert!(target.is_file(), "it didn't touch the file");
         assert!(dir.path().is_dir(), "it won't touch the boundary");
         Ok(())

gix-glob/src/search/pattern.rs

@@ -68,7 +68,7 @@ fn io_err_is_dir(err: &std::io::Error) -> bool {
     let raw = err.raw_os_error();
     raw == Some(if cfg!(windows) { 5 } else { 21 }) /* Not a directory */
         /* Also that, but under different circumstances */
-        || raw == Some(20)
+        || raw == Some(20) || err.kind() == std::io::ErrorKind::NotADirectory
 }
 
 /// Instantiation

gix-odb/src/store_impls/dynamic/init.rs

@@ -89,7 +89,7 @@ impl Store {
         )?;
         if !objects_dir.is_dir() {
             return Err(std::io::Error::new(
-                std::io::ErrorKind::Other, // TODO: use NotADirectory when stabilized
+                std::io::ErrorKind::NotADirectory,
                 format!("'{}' wasn't a directory", objects_dir.display()),
             ));
         }