netfilter: fix description of expected checkentry return code on xt_target
The text describing the return codes that are expected on calls to checkentry() was incorrect. Instead of returning true or false, or an error code, it should return 0 or an error code. Signed-off-by: NLuciano Coelho <luciano.coelho@nokia.com> Signed-off-by: NPatrick McHardy <kaber@trash.net>
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