IPoIB/cm: Fix warning if IPV6 is not enabled

Fix

    drivers/infiniband/ulp/ipoib/ipoib_cm.c:1151: warning: unused variable 'dev'

by getting rid of the variable dev, which is only used if CONFIG_IPV6
is enabled, and replacing the one use of it with the value it is
assigned, namely priv->dev.
Signed-off-by: NRoland Dreier <rolandd@cisco.com>

drivers/infiniband/ulp/ipoib/ipoib_cm.c

@@ -1148,7 +1148,6 @@ static void ipoib_cm_skb_reap(struct work_struct *work)
 {
 	struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
 						   cm.skb_task);
-	struct net_device *dev = priv->dev;
 	struct sk_buff *skb;
 
 	unsigned mtu = priv->mcast_mtu;
@@ -1162,7 +1161,7 @@ static void ipoib_cm_skb_reap(struct work_struct *work)
 			icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 		else if (skb->protocol == htons(ETH_P_IPV6))
-			icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev);
+			icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, priv->dev);
 #endif
 		dev_kfree_skb_any(skb);
 		spin_lock_irq(&priv->tx_lock);