[PATCH] net_failover: fixed rollback in net_failover_open()

[Vasily Averin]

found by smatch:
drivers/net/net_failover.c:65 net_failover_open() error:
 we previously assumed 'primary_dev' could be null (see line 43)

cc: sta...@vger.kernel.org
Fixes: cfc80d9a1163 ("net: Introduce net_failover driver")
Signed-off-by: Vasily Averin <v...@virtuozzo.com>
---
 drivers/net/net_failover.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/net_failover.c b/drivers/net/net_failover.c
index b16a122..fb182be 100644
--- a/drivers/net/net_failover.c
+++ b/drivers/net/net_failover.c
@@ -61,7 +61,8 @@ static int net_failover_open(struct net_device *dev)
        return 0;
 
 err_standby_open:
-       dev_close(primary_dev);
+       if (primary_dev)
+               dev_close(primary_dev);
 err_primary_open:
        netif_tx_disable(dev);
        return err;
-- 
1.8.3.1