hamradio: dmascc: avoid -Wformat-overflow warning

gcc warns that the device name might overflow:

drivers/net/hamradio/dmascc.c: In function 'dmascc_init':
drivers/net/hamradio/dmascc.c:584:22: error: 'sprintf' may write a terminating nul past the end of the destination [-Werror=format-overflow=]
   sprintf(dev->name, "dmascc%i", 2 * n + i);
drivers/net/hamradio/dmascc.c:584:3: note: 'sprintf' output between 8 and 17 bytes into a destination of size 16
   sprintf(dev->name, "dmascc%i", 2 * n + i);

>From the static data in this file, I can tell that the index is
strictly limited to 16, so it won't overflow. This simply changes
the sprintf() to snprintf(), which is a good idea in general,
and shuts up this warning.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/hamradio/dmascc.c

@@ -581,7 +581,7 @@ static int __init setup_adapter(int card_base, int type, int n)
 		priv->param.dma = -1;
 		INIT_WORK(&priv->rx_work, rx_bh);
 		dev->ml_priv = priv;
-		sprintf(dev->name, "dmascc%i", 2 * n + i);
+		snprintf(dev->name, sizeof(dev->name), "dmascc%i", 2 * n + i);
 		dev->base_addr = card_base;
 		dev->irq = irq;
 		dev->netdev_ops = &scc_netdev_ops;