K 10
svn:author
V 3
pjd
K 8
svn:date
V 27
2011-10-21T14:00:48.992940Z
K 7
svn:log
V 185
zfs vdev_file_io_start: validate vdev before using vdev_tsd

vdev_tsd can be NULL for certain vdev states.
At least in userland testing with ztest.

Submitted by:	avg
MFC after:	3 days

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