K 10
svn:author
V 3
avg
K 8
svn:date
V 27
2017-07-18T07:41:38.758284Z
K 7
svn:log
V 497
fix a regression in r320452, ZFS ABD import

I overlooked the fact that vdev_op_io_done hook is called even if the
actual I/O is skipped, for example, in the case of a missing vdev.
Arguably, this could be considered an issue in the zio pipeline engine,
but for now I am adding defensive code to check for io_bp being NULL
along with assertions that that happens only when it can be really
expected.

PR:		220691
Reported by:	peter, cy
Tested by:	cy
MFC after:	1 week
X-MFC with:	r320156, r320452

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