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Handle locking and memory safety for IPV6_PATHMTU in ip6_ctloutput().

Description

Handle locking and memory safety for IPV6_PATHMTU in ip6_ctloutput().

Submitted by: Jason Eggleston <jason@eggnet.com>
Reviewed by: ae
Sponsored by: Limelight Networks
Differential Revision: https://reviews.freebsd.org/D14622