m_tag_init() unused

  Dear sirs,

  browsing mbuf code I have found, that m_tag_init() is never used within
the source tree. I have also noted, that there is m_tag_setup() with the
following comment:

 * XXX probably should be called m_tag_init; but that was
 * already taken.

Attached patches remove m_tag_init(), rename m_tag_setup() to
m_tag_init(), and fix the only call to m_tag_setup().

I've tested them by rebuilding kernel and performing some network activity
on divert socket.

-- 
Totus tuus, Glebius.
GLEBIUS-RIPN GLEB-RIPE