[IPV6]: File the fingerprints off ah6->spi/esp6->spi

In theory these are opaque 32bit values. However, we end up
allocating them sequentially in host-endian and stick unchanged
on the wire.

Signed-off-by: Al Viro <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/ipv6/xfrm6_tunnel.c

···
 	x6spi = __xfrm6_tunnel_spi_lookup(saddr);
 	spi = x6spi ? x6spi->spi : 0;
 	read_unlock_bh(&xfrm6_tunnel_spi_lock);
-	return spi;
+	return htonl(spi);
 }
 
 EXPORT_SYMBOL(xfrm6_tunnel_spi_lookup);
···
 		spi = __xfrm6_tunnel_alloc_spi(saddr);
 	write_unlock_bh(&xfrm6_tunnel_spi_lock);
 
-	return spi;
+	return htonl(spi);
 }
 
 EXPORT_SYMBOL(xfrm6_tunnel_alloc_spi);