Two regressions were introduced by the recent tlan: 64bit conversion
commit (93e16847).  The first in
TLan_GetSKB caused a NULL pointer dereference.  With the second causing
the link to fail to come up.
Signed-off-by: NRobert Fitzsimons <robfitz@273k.net>
Signed-off-by: NJeff Garzik <jgarzik@redhat.com>