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Now that we can legitimately have ngroups == 0 as a result of calling crsetgroups(), set a flag when we've set groups for the sake of sanity checking usage of crextend(). While it's true this flag will only really be used under INVARIANTS, it's only the second flag bit that we're adding in 16 years. Reviewed by: olce Differential Revision: https://reviews.freebsd.org/D51646