sonic: Fix build after ndo_start_xmit() changes.

Noticed by Stephen Rothwell.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/sonic.c b/drivers/net/sonic.c
index e4255d8..753a1fb 100644
--- a/drivers/net/sonic.c
+++ b/drivers/net/sonic.c
@@ -223,7 +223,7 @@
 	if (!laddr) {
 		printk(KERN_ERR "%s: failed to map tx DMA buffer.\n", dev->name);
 		dev_kfree_skb(skb);
-		return NETDEV_TX_BUSY
+		return NETDEV_TX_BUSY;
 	}
 
 	sonic_tda_put(dev, entry, SONIC_TD_STATUS, 0);       /* clear status */