libipt_REDIRECT: "--to-ports" is not mandatory

The REDIRECT target can be called without the --to-ports option
being specified. From the manual page:
  ...without this, the destination port is never altered.

Signed-off-by: Lutz Jaenicke <ljaenicke@innominate.com>
Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
1 file changed