MFC rev. 1.23:   Since m_pullup() can return a new mbuf, change gre_input2() to   return mbuf back to gre_input(). If the former returns mbuf back   to the latter, then pass it to raw_input().
MFC rev. 1.23:
  Since m_pullup() can return a new mbuf, change gre_input2() to
  return mbuf back to gre_input(). If the former returns mbuf back
  to the latter, then pass it to raw_input().

  Coverity ID:    829

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase