libxt_conntrack: fix --ctproto 0 output

First, we are missing XTOPT_PUT when trying to use XTOPT_POINTER.
(Next commit will flag this.) Furthermore, l4proto is of type
uint16_t, while XTTYPE_PROTOCOL wants a uint8_t so the idea would not
work => revert v1.4.12~1^2.

Bug goes back to v1.4.12~1^2.

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
1 file changed