FreeBSD/src b1536a8 (r348236)sys/netinet6 in6_src.c

Restore IPV6_NEXTHOP option support that seem was partially broken
since r286195.

Do not forget results of route lookup and initialize rt and ifp pointers.

PR:             238098
Submitted by:   Masse Nicolas <nicolas.masse at stormshield eu>
MFC after:      1 week
DeltaFile
+4-0sys/netinet6/in6_src.c
+4-01 files

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