- if condition fix for ata_dev_identify()
  - ata_pio_poll() minor cleanup.

Changes:
   - Use (dev->class == ATA_DEV_ATA) for ata_dev_identify()
     since "qc->tf.command" has been overwritten by the device status
   - Use HSM_ST_TMOUT directly in ata_pio_poll()
Signed-off-by: NAlbert Lee <albertcc@tw.ibm.com>

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Signed-off-by: NJeff Garzik <jgarzik@pobox.com>