Change a comment to be slightly easier to read
Reorder code to have all toplevel code in 'main'

Change-Id: Ia99830ce2ee6af46249f533d64a328d2da2ed9b8
Reviewed-on: https://code.wireshark.org/review/3141
Reviewed-by: Jörg Mayer <jmayer@loplof.de>