netxen_nic: restrict force firmware dump when dump is disabled.

o Set the ethtool_dump flag (=ETH_FW_DUMP_DISABLE) when dump is disabled.
o update driver version to 4.0.80

Signed-off-by: Manish chopra <manish.chopra@qlogic.com>
Signed-off-by: Rajesh Borundia <rajesh.borundia@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>