MFC r196866:   In the NEXTADDR macro use SA_SIZE() rather than directly using   sizeof(), as introduced in r186119, for advancing the current   position into the buffer.   See comment in net/route.h for a description of the difference.   This makes ndp -s work again.
MFC r196866:
  In the NEXTADDR macro use SA_SIZE() rather than directly using
  sizeof(), as introduced in r186119, for advancing the current
  position into the buffer.
  See comment in net/route.h for a description of the difference.
  This makes ndp -s work again.

   Reviewed by:	qingli

Approved by:	re (kib)

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