CCBC-153 Nullify the address info to avoid doublefree

Change-Id: I15e37d8eecf0bb52fafabea93668da0664e48b4d
Reviewed-on: http://review.couchbase.org/23663
Reviewed-by: Matt Ingenthron <matt@couchbase.com>
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>
Tested-by: Sergey Avseyev <sergey.avseyev@gmail.com>