[Bro-Commits] [git/bro] topic/jsiwek/ipv6-ext-headers: Fix some IPv6 header related bugs. (6530776)

   Fix some IPv6 header related bugs.

   - IPv6 payload length calculation didn't count main 40 byte IPv6 header.

Er, I realize that sounds confusing: it shouldn't (doesn't) count the main header as part of the payload. What I meant was I accidentally subtracted the main header length from the payload length field when that field doesn't count the main header in the first place.