attr: Do not walk path if we're at the root

src/attr.c

@@ -422,9 +422,7 @@ static int collect_attr_files(
 	/* Resolve path in a non-bare repo */
 	if (workdir != NULL)
 		error = git_path_find_dir(&dir, path, workdir);
-	/* when in a bare repo, find the containing folder if the given
-	 * path is a subfolder (if not, the containing folder is the root) */
-	else if (strchr(path, '/') != NULL)
+	else
 		error = git_path_dirname_r(&dir, path);
 	if (error < 0)
 		goto cleanup;
@@ -449,7 +447,12 @@ static int collect_attr_files(
 		giterr_clear(); /* no error even if there is no index */
 	info.files = files;
 
+	if (!strcmp(dir.ptr, ".")) {
+		error = push_one_attr(&info, "");
+	} else {
 		error = git_path_walk_up(&dir, workdir, push_one_attr, &info);
+	}
+
 	if (error < 0)
 		goto cleanup;