We expected 0 if module doesn't exist, which is no longer the case
(42046e2e45c109ba703993c510401a11f716c8df,
netfilter: x_tables: return -ENOENT for non-existant matches/targets).
Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>