systemctl: make sure daemon-reload returns success

Also change sd_bus_message_exit_container to return -ENOENT
when not in a container, to make it easier to distinguish different
errors.

src/libsystemd-bus/bus-message.c

@@ -3018,7 +3018,7 @@ _public_ int sd_bus_message_exit_container(sd_bus_message *m) {
 
         assert_return(m, -EINVAL);
         assert_return(m->sealed, -EPERM);
-        assert_return(m->n_containers > 0, -EINVAL);
+        assert_return(m->n_containers > 0, -ENOENT);
 
         c = message_get_container(m);
         if (c->enclosing == SD_BUS_TYPE_ARRAY) {

src/systemctl/systemctl.c

@@ -3762,7 +3762,7 @@ static int daemon_reload(sd_bus *bus, char **args) {
         else if (r < 0)
                 log_error("Failed to execute operation: %s", bus_error_message(&error, r));
 
-        return r;
+        return r < 0 ? r : 0;
 }
 
 static int reset_failed(sd_bus *bus, char **args) {