[PATCH] (ata.mod) avoid passing grub_errno to upper layer

[Robert Millan]

Hi,

When an error is detected by ata.mod during drive scan, it will pass it to
the upper layer.  This results in GRUB aborting when trying to enter normal
mode, even if the error is not critical (e.g. affects a drive not used during
boot).

There are a number of places in ata.mod where these errors could be handled,
so I'm not sure if my proposed change would be the best approach.  Some comment
would be appreciated.

-- 
Robert Millan

  The DRM opt-in fallacy: "Your data belongs to us. We will decide when (and
  how) you may access your data; but nobody's threatening your freedom: we
  still allow you to remove your data and not access it at all."

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