netfilter: use nf_conntrack_helpers_register when possible
amanda_helper, nf_conntrack_helper_ras and nf_conntrack_helper_q931 are all arrays, so we can use nf_conntrack_helpers_register to register the ct helper, this will help us to eliminate some "goto errX" statements. Also introduce h323_helper_init/exit helper function to register the ct helpers, this is prepared for the followup patch, which will add net namespace support for ct helper. Signed-off-by: Liping Zhang <zlpnobody@gmail.com> Acked-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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