From: YueHaibing <yuehaibing@xxxxxxxxxx>
Date: Tue, 4 Sep 2018 02:56:26 +0000
> Fixes gcc '-Wunused-but-set-variable' warning:
>
> drivers/net/net_failover.c: In function 'net_failover_slave_unregister':
> drivers/net/net_failover.c:598:35: warning:
> variable 'primary_dev' set but not used [-Wunused-but-set-variable]
>
> There should check the validity of 'slave_dev'.
>
> Fixes: cfc80d9a1163 ("net: Introduce net_failover driver")
>
> Signed-off-by: YueHaibing <yuehaibing@xxxxxxxxxx>
> ---
> v2: use WARN_ON_ONCE as Liran Alon suggested
Applied.
