conf: improve lxc_clear_cgroups()

src/lxc/conf.c

@@ -3684,7 +3684,7 @@ int lxc_clear_cgroups(struct lxc_conf *c, const char *key, int version)
 		namespaced_token_len	= STRLITERALLEN("lxc.cgroup.");
 		list = &c->cgroup;
 	} else {
-		return -EINVAL;
+		return ret_errno(EINVAL);
 	}
 
 	if (strequal(key, global_token))
@@ -3692,7 +3692,7 @@ int lxc_clear_cgroups(struct lxc_conf *c, const char *key, int version)
 	else if (strnequal(key, namespaced_token, namespaced_token_len))
 		k += namespaced_token_len;
 	else
-		return -EINVAL;
+		return ret_errno(EINVAL);
 
 	lxc_list_for_each_safe (it, list, next) {
 		struct lxc_cgroup *cg = it->elem;