eugen 5d8549519a Fix use-after-free that sometimes results in a garbage returned
instead of right error code after requests to SINGLE/CONCAT volumes, f.e:

# dd if=/dev/raid/r0 bs=512 of=/dev/null
dd: /dev/raid/r0: Unknown error: -559038242

Reviewed by:	avg (mentor), mav (mentor)
MFC after:	3 days
2017-12-07 05:55:18 +00:00
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