netfilter: xt_CT: fix error value in xt_ct_tg_check()
If setting event mask fails then we were returning 0 for success. This patch updates return code to -EINVAL in case of problem. Signed-off-by: NEric Leblond <eric@regit.org> Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>
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