- Check the return value of taskqueue_start_threads(). - At least the Saturn chips of 501-6738 cards need a delay after freezing   the external GMII pins before the internal PHY is accessible again. So   wait a bit after (un)freezing these. Also don't touch the other bits of   that configuration register. [1] - Take advantage of nitems().
- Check the return value of taskqueue_start_threads().
- At least the Saturn chips of 501-6738 cards need a delay after freezing
  the external GMII pins before the internal PHY is accessible again. So
  wait a bit after (un)freezing these. Also don't touch the other bits of
  that configuration register. [1]
- Take advantage of nitems().

Reported and tested by: Paul Keusemann [1]

MFC after:	3 days

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