prevent null socket dereference in IPv6 interface address adjustment [RT #18203]
prevent null socket dereference in IPv6 interface address adjustment
[RT #18203]

pecharmin/bind9,pecharmin/bind9,each/bind9-collab,each/bind9-collab,pecharmin/bind9,each/bind9-collab,each/bind9-collab,each/bind9-collab,each/bind9-collab,pecharmin/bind9,pecharmin/bind9,pecharmin/bind9