hamradio: 6pack: remove unnecessary check

this is check for dev is unnecessary, as we are already checking dev
after allocating it via alloc_netdev, and jumping to label: out
if it is NULL.
Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/hamradio/6pack.c

@@ -675,7 +675,6 @@ static int sixpack_open(struct tty_struct *tty)
 	kfree(xbuff);
 	kfree(rbuff);
 
-	if (dev)
 	free_netdev(dev);
 
 out: