Alan Somers f60b4812d8 Fix page fault in zfsctl_snapdir_getattr
Must acquire the z_teardown_lock before accessing the zfsvfs_t object. I
can't reproduce this panic on demand, but this looks like the correct
solution.

PR:		247668
Reviewed by:	avg
MFC after:	2 weeks
Sponsored by:	Axcient
Differential Revision:	https://reviews.freebsd.org/D25543
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