Merge pull request from GHSA-cv8x-p47p-99wr

* - Avoid SSL socket parent/listener getting destroyed during handshake by increasing parent's reference count.
- Add missing SSL socket close when the newly accepted SSL socket is discarded in SIP TLS transport.

* - Fix silly mistake: accepted active socket created without group lock in SSL socket.
- Replace assertion with normal validation check of SSL socket instance in OpenSSL verification callback (verify_cb()) to avoid crash, e.g: if somehow race condition with SSL socket destroy happens or OpenSSL application data index somehow gets corrupted.