Jeff Garzik ad36d1a533 [libata ahci] error handling fixes
Needed to get ATAPI working.

- dump hardware error bits, if hardware signals an error
- only reset hardware during timeout if a command was active
- call ata_qc_complete() with a fine-grained error mask.
  Needed so that atapi_qc_complete() can distinguish between
  device errors and other errors.
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