Correct a cast to make it compile on 64bit platforms (noticed by tinderbox) and remove two unneccessary variable initializations. Make the introduction comment more clear with regard which parts of the packet are touched.
Correct a cast to make it compile on 64bit platforms (noticed by tinderbox)
and remove two unneccessary variable initializations.
Make the introduction comment more clear with regard which parts of
the packet are touched.

Requested by:	luigi

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