Use netdev_alloc_skb.  This sets skb->dev and allows arch specific
allocation.  Also simplify and cleanup the alignment code.
Signed-off-by: NStephen Hemminger <shemminger@vyatta.com>
Signed-off-by: NMaciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: NJeff Garzik <jgarzik@redhat.com>