ne2k-pci: use dev->addr_len instead of "6"

Spotted a tiny ugliness in a recently posted patch. This patch cuts it out.

Jirka

Signed-off-by: Jiri Pirko <jpirko@redhat.com>
 drivers/net/ne2k-pci.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
Signed-off-by: David S. Miller <davem@davemloft.net>