net: link_local: Fix netmask endianness bug

The network mask must be stored in network order when in a
'struct in_addr'.

This fix removes the "gatewayip needed but not set" message on the
console when using a link-local IP setup.

Signed-off-by: Alexandre Messier <amessier@tycoint.com>
Signed-off-by: Sylvain Lemieux <slemieux@tycoint.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>

net/link_local.c

@@ -111,7 +111,7 @@ void link_local_start(void)
 		net_set_state(NETLOOP_FAIL);
 		return;
 	}
-	net_netmask.s_addr = IN_CLASSB_NET;
+	net_netmask.s_addr = htonl(IN_CLASSB_NET);
 
 	seed = seed_mac();
 	if (ip.s_addr == 0)