[PATCH] libata irq-pio: eliminate unnecessary queuing in ata_pio_first_block()

   - change the return value of ata_pio_complete() 0 <-> 1
   - add return value for ata_pio_first_block()
   - rename variable "qc_completed" to "has_next" in ata_pio_task()
   - use has_next to eliminate unnecessary queuing in ata_pio_first_block()

Signed-off-by: Albert Lee <albertcc@tw.ibm.com>

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