failover_init() ignores register_netdevice_notifier() errors and always returns success, which can leave the failover module loaded without its netdev notifier registered. Return the notifier registration result directly so module initialization fails when registration fails. This is a future looking check, register_netdevice_notifier() only fails on double registration or if the registered notifier itself returns an error. Signed-off-by: Minhong He <heminhong@kylinos.cn> Link: https://patch.msgid.link/20260731030338.82508-1-heminhong@kylinos.cn Signed-off-by: Jakub Kicinski <kuba@kernel.org>