If register_netdev() fails we return success but we should return an
error code instead.

Reported-by: RUC_Soft_Sec <zy900...@163.com>
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>

diff --git a/drivers/net/hamradio/mkiss.c b/drivers/net/hamradio/mkiss.c
index 2ffbf13..dcb6bb7 100644
--- a/drivers/net/hamradio/mkiss.c
+++ b/drivers/net/hamradio/mkiss.c
@@ -732,7 +732,8 @@ static int mkiss_open(struct tty_struct *tty)
                goto out_free_netdev;
        }
 
-       if (register_netdev(dev))
+       err = register_netdev(dev);
+       if (err)
                goto out_free_buffers;
 
        /* after register_netdev() - because else printk smashes the kernel */
--
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