Correct auditctl() prototype; it was changed at some point in HEAD, but not
MFC'd to -STABLE, resulting in the arguments being interpreted incorrectly.
As a result, some users of audit on -STABLE saw an invalid argument error
when starting the audit daemon. In principle it should have been all audit
users, not clear why that appears not to have been the case.

Approved by: re (kensmith)
Obtained from: TrustedBSD Project