libipt_ULOG: fix --ulog-cprange

In 1f2474a libipt_ULOG: use guided option parser.

A bug has been accidentally introduced in --ulog-cprange, limiting
possible values from 1 to 50. However, that limit should be applied
to --ulog-qthreshold.

Reported-by: Gaurav Sinha <vgsinha@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
1 file changed