Move the vlan buffer space into the union which also fixes an unused variable warning with !INET & !INET6.
Move the vlan buffer space into the union which also fixes an unused variable
warning with !INET & !INET6.

Spotted by:	pluknet

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