confile: use set_config_path_item() for most cgroup layout modifiers

src/lxc/confile.c

@@ -1684,7 +1684,7 @@ static int set_config_cgroup_dir(const char *key, const char *value,
 	if (lxc_config_value_empty(value))
 		return clr_config_cgroup_dir(key, lxc_conf, NULL);
 
-	return set_config_string_item(&lxc_conf->cgroup_meta.dir, value);
+	return set_config_path_item(&lxc_conf->cgroup_meta.dir, value);
 }
 
 static int set_config_cgroup_relative(const char *key, const char *value,