Apply fix from mrouted 3.8 via NetBSD. Our mbone support may
authorkrw <krw@openbsd.org>
Wed, 3 Aug 2016 23:13:54 +0000 (23:13 +0000)
committerkrw <krw@openbsd.org>
Wed, 3 Aug 2016 23:13:54 +0000 (23:13 +0000)
commit5ae4c81e21152c3aec1e7a652d66222f43be3ed7
tree13f958ac36970d7614969ae615d58b68ce2a1cf7
parentf62ed2320675eed61896fb6925e1dbea2a21bc18
Apply fix from mrouted 3.8 via NetBSD. Our mbone support may
be slightly dated.

Spotted by the Echelon team with AppChecker static analyzer.
usr.sbin/map-mbone/mapper.c