[NET]: Wrap netdevice hardware header creation.

Add inline for common usage of hardware header creation, and
fix bug in IPV6 mcast where the assumption about negative return is
an errno. Negative return from hard_header means not enough space
was available,(ie -N bytes).

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 2 deletions

diff --git a/include/net/dn_route.h b/include/net/dn_route.h
index c10e8e7e59a7..60c9f22d8694 100644
--- a/include/net/dn_route.h
+++ b/include/net/dn_route.h
@@ -100,8 +100,7 @@ static inline void dn_rt_finish_output(struct sk_buff *skb, char *dst, char *src
         if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
                 dst = NULL;
 
-        if (!dev->hard_header || (dev->hard_header(skb, dev, ETH_P_DNA_RT,
-                        dst, src, skb->len) >= 0))
+        if (dev_hard_header(skb, dev, ETH_P_DNA_RT, dst, src, skb->len) >= 0)
                 dn_rt_send(skb);
         else
                 kfree_skb(skb);