clear up errors from more -W options: disambiguate length variables
provide proper pcap file for test case
switch rpl_dio_print to use tok2str
Fix build on FreeBSD.

Looks like there was a mistake made in d8acd8f that broke the build
on systems where print-pflog.c is compiled. This fixes the build.
Merge pull request #353 from wxsBSD/pflog_fix

Fix build with print-pflog.c.
Merge remote-tracking branch 'github/master'