[libata] sata_mv: errata check buglet fix
Fix a buglet; the errata check below this code is assuming the value in the sstatus variable is what was pulled out of the SCR_STATUS register. However, the status checks in the timeout loop clobber everything but the first 4 bits of sstatus, so the errata checks are invalid. This patch changes it to not clobber SStatus. Signed-off-by: NAndres Salomon <dilinger@debian.org> Signed-off-by: NJeff Garzik <jeff@garzik.org>
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