zfs: fix a wrong assertion for extended attributes
For the extended attributes the order between z_teardown_lock and the
vnode lock is different.
The bug was triggered only with DIAGNOSTIC turned on.
This fix is developed in cooperation with avos.
PR: 213112
Reported by: avos
Tested by: avos
MFC after: 1 week
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head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vnops.c