12513 SMB 3.1.1 support for server

*** 19,28 ****
--- 19,29 ----
   * CDDL HEADER END
   */
  /*
   * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
   * Copyright 2019 Nexenta Systems, Inc.  All rights reserved.
+  * Copyright 2020 RackTop Systems, Inc.
   */
  
  #include <sys/atomic.h>
  #include <sys/synch.h>
  #include <sys/types.h>
*** 855,864 ****
--- 856,868 ----
          if (session->signing.mackey != NULL) {
                  kmem_free(session->signing.mackey,
                      session->signing.mackey_len);
          }
  
+         if (session->preauth_mech != NULL)
+                 smb31_preauth_fini(session);
+ 
          session->s_magic = 0;
  
          smb_rwx_destroy(&session->s_lock);
          smb_net_txl_destructor(&session->s_txlst);