kern/173521: [ip6] remove useless assign in ip6_hopopts_input

[linimon at FreeBSD.org]

Old Synopsis: remove useless assign in ip6_hopopts_input
New Synopsis: [ip6] remove useless assign in ip6_hopopts_input

Responsible-Changed-From-To: freebsd-bugs->freebsd-net
Responsible-Changed-By: linimon
Responsible-Changed-When: Thu Apr 17 04:25:45 UTC 2014
Responsible-Changed-Why: 
reassign.

http://www.freebsd.org/cgi/query-pr.cgi?pr=173521