markj 7dbd75884a Fix a lock leak in g_mirror_destroy().
g_mirror_destroy() is supposed to unlock the softc before indicating
success, but it wasn't doing so if the caller raced with another
thread destroying the mirror.

MFC after:	1 week
Sponsored by:	Dell EMC Isilon
2017-10-27 17:05:14 +00:00
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