[PATCH net] net: failover: check register_netdevice_notifier() error in failover_init()

failover_init() ignores register_netdevice_notifier() errors and always
returns success, which can leave the failover module loaded without its
netdev notifier registered.

Check the error and fail module initialization early.

Signed-off-by: Minhong He <redacted>
---
 net/core/failover.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/net/core/failover.c b/net/core/failover.c
index e43c59cd6868..b28cc6f77204 100644
--- a/net/core/failover.c
+++ b/net/core/failover.c

@@ -302,7 +302,11 @@ EXPORT_SYMBOL_GPL(failover_unregister);
 static __init int
 failover_init(void)
 {
-	register_netdevice_notifier(&failover_notifier);
+	int err;
+
+	err = register_netdevice_notifier(&failover_notifier);
+	if (err)
+		return err;
 
 	return 0;
 }

-- 
2.25.1