We aren't getting any module info for the txandx option because
of a typo:

parm:           txandrx:bool
Signed-off-by: NAnton Blanchard <anton@samba.org>
Acked-by: NDavid Härdeman <david@hardeman.nu>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>