firewire net: Ensure checksumming in upper layer.

It is wrong to set skb->ip_summed to CHECKSUM_UNNECESSARY unless
the device has already checked it.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
1 file changed