LRO is only applied to IPv4 pkts, so don't use the LRO indication functions
for anything other IPv4 pkts.  Every non-IPv4 pkt is indicated using non-
LRO functions.
Signed-off-by: NScott Feldman <scofeldm@cisco.com>
Signed-off-by: NJeff Garzik <jgarzik@redhat.com>