libata sata_qstor conversion to new error handling (EH).

sata_qstor conversion to new error handling (EH).

Convert sata_qstor to use the newer libata EH mechanisms.
Based on earlier work by Jeff Garzik.

Signed-off-by:  Mark Lord <mlord@pobox.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
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