Martin Matuska 55a381515b Fix kernel panic when calling spa_tryimport() on a corrupted pool.
OpenSolaris onnv revision:	8680:005fe27123ba

Approved by:	delphij (mentor)
Obtained from:	OpenSolaris (Bug ID 6786321)
MFC after:	1 day
2010-05-23 10:13:11 +00:00
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