scsi: qla2xxx: fix typo "CT-PASSTRHU" -> "CT-PASSTHRU"

Trivial fix to typo in debug message text.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Acked-by: Himanshu Madhani <himanshu.madhani@cavium.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>