1)optind according iptables sources have to be set to 0. If it is set to 1, in
batch it will mess up things. Also in iptables sources i notice that ->tflags
and ->used need to be reset.
2)Since target->t = fw_calloc(1, size); allocated memory in function build_st,
it have to be freed at the end, or in batch we will have memory leak. TODO:
Probably it must be freed in all "return -1" cases in parse_ipt after
build_st. About this i am not sure, up to Stephen.