bonding: bond_xmit_roundrobin() fix

Commit a2fd940 (bonding: fix broken multicast with round-robin mode)
added a problem on litle endian machines.

drivers/net/bonding/bond_main.c:4159: warning: comparison is always
false due to limited range of data type

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/bonding/bond_main.c

@@ -4156,7 +4156,7 @@ static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev
 	 * send the join/membership reports.  The curr_active_slave found
 	 * will send all of this type of traffic.
 	 */
-	if ((iph->protocol == htons(IPPROTO_IGMP)) &&
+	if ((iph->protocol == IPPROTO_IGMP) &&
 	    (skb->protocol == htons(ETH_P_IP))) {
 
 		read_lock(&bond->curr_slave_lock);