pknock: remove some extraneous messages and source lines

- $Id$ in a comment is pointless.
- remove unneeded/commented-out includes.
- remove warning messages on allocation failure
  (if that happens it is almost too late anyway;
  not wanting to spam the logs)
- remove warning messages about unhandled packets
  (attacker filling up logs)

extensions/libxt_pknock.c

@@ -5,8 +5,6 @@
  * (C) 2006-2009 J. Federico Hernandez <fede.hernandez@gmail.com>
  * (C) 2006 Luis Floreani <luis.floreani@gmail.com>
  *
- * $Id$
- *
  * This program is released under the terms of GNU GPL version 2.
  */
 #include <getopt.h>
@@ -17,7 +15,6 @@
 #include <xtables.h>
 #include <linux/netfilter.h>
 #include <linux/netfilter_ipv4/ip_tables.h>
-//#include <linux/netfilter_ipv4/ipt_pknock.h>
 #include "xt_pknock.h"
 
 static const struct option pknock_mt_opts[] = {
@@ -105,7 +102,6 @@ check_proto(uint16_t pnum, uint8_t invflags)
 		xtables_error(PARAMETER_PROBLEM, PKNOCK "only works with TCP and UDP.");
 }
 
-/* Function which parses command options; returns true if it ate an option */
 static int
 __pknock_parse(int c, char **argv, int invert, unsigned int *flags,
 		struct xt_entry_match **match, uint16_t pnum,