asomers 7c423a65c9 Fix "Bad tailq" panic when auditing auditon(A_SETCLASS, ...)
Due to an oversight in r195280, auditon(A_SETCLASS, ...) would cause a tailq
element to get added to the tailq twice, resulting in a circular tailq. This
panics when INVARIANTS are on.

MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D15381
2018-05-28 20:47:39 +00:00
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