bna: Embed SKB Length in TX Vector

- Store the length of the skb buffer mapped along with the handle and use it
   while unmapping the buffer.

Signed-off-by: Rasesh Mody <rmody@brocade.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc drivers/net/ethernet/brocade/bna/bnad.c
Simple merge

diff --cc drivers/net/ethernet/brocade/bna/bnad.h
Simple merge