Fix a bug of retrieving configuration ROM. - Handle directories and leaves other than unit directories and text leaves   correctly. - Now we can retrieve CROM of iSight correctly.
Fix a bug of retrieving configuration ROM.
- Handle directories and leaves other than unit directories and text leaves
  correctly.
- Now we can retrieve CROM of iSight correctly.

Approved by: re (hrs)
Tested by: flz
MFC after: 3 days

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