[PATCH 1/2] enic: Fix build without _HAVE_ARCH_IPV6_CSUM

[Roland Dreier <rdreier@cisco.com>]

From: Scott Feldman <scofeldm@cisco.com>

On architectures (such as powerpc) that don't define
_HAVE_ARCH_IPV6_CSUM, the enic compile fails with

    drivers/net/enic/enic_main.c: In function 'enic_queue_wq_skb_tso':
    drivers/net/enic/enic_main.c:575: error: implicit declaration of function 'csum_ipv6_magic'

Fix this by including <net/ip6_checksum.h>

Signed-off-by: Roland Dreier <rolandd@cisco.com>
---
Jeff, this is part of a patch Scott sent a while ago
(https://kerneltrap.org/mailarchive/linux-netdev/2008/9/20/3350614/thread)
that seems to have gotten dropped.  Please apply.

 drivers/net/enic/enic_main.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/net/enic/enic_main.c b/drivers/net/enic/enic_main.c
index f3a47a8..80119c9 100644
--- a/drivers/net/enic/enic_main.c
+++ b/drivers/net/enic/enic_main.c
@@ -35,6 +35,8 @@
 #include <linux/ipv6.h>
 #include <linux/tcp.h>
 
+#include <net/ip6_checksum.h>
+
 #include "cq_enet_desc.h"
 #include "vnic_dev.h"
 #include "vnic_intr.h"