iptables.c - printf in exit_help not correct

[Kees Bakker]

Hi,

In version 0.1.17 of netfilter iptables.c (function exit_printhelp) has
an incorrect printf where it tries to print the usage. There are two
program_name's missing. It becomes quite obvious if you do
 'iptables -h'.

This printf statement is not how I would write it. I would simply repeat
printf and its parameters. 
	printf("       %s -D chain rulenum [options]\n", program_name);
	printf("       %s -[LFZNX] [chain] [options]\n", program_name);
	printf("       %s -P chain target [options]\n", program_name);
It is still readable, and ... it prevents errors when someone wants to add
stuff.
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