MFC r275393:
  Remove unneded check. No need to do m_pullup to the size that we prepended.

MFC r275473:
  Fix style(9) and remove m_freem(NULL).
  Add XXX comment, it looks incorrect, because m_pkthdr.len is already
  incremented by M_PREPEND().

Sponsored by:	Yandex LLC
MFC r275394:
  Remove unneded check. No need to do m_pullup to the size that we prepended.

Sponsored by:	Yandex LLC