MFC 1.84 by yar:   Test the new M_VLANTAG packet flag before calling   m_tag_locate().  This adds little overhead of a simple   bitwise operation in case hardware VLAN acceleration   is on, yet saves the more expensive function call if   the acceleration is off.
MFC 1.84 by yar:
  Test the new M_VLANTAG packet flag before calling
  m_tag_locate().  This adds little overhead of a simple
  bitwise operation in case hardware VLAN acceleration
  is on, yet saves the more expensive function call if
  the acceleration is off.

  Reviewed by:	ru, glebius

Approved by:	re (kensmith)

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