5042 stop using deprecated atomic functions

*** 59,70 ****
          kstat_t                 *esp_ksp;
          struct esp_kstats_s     *esp_kstats;
  
          /*
           * Keysock instance of ESP.  There can be only one per stack instance.
!          * Use casptr() on this because I don't set it until KEYSOCK_HELLO
!          * comes down.
           * Paired up with the esp_pfkey_q is the esp_event, which will age SAs.
           */
          queue_t                 *esp_pfkey_q;
          timeout_id_t            esp_event;
  
--- 59,70 ----
          kstat_t                 *esp_ksp;
          struct esp_kstats_s     *esp_kstats;
  
          /*
           * Keysock instance of ESP.  There can be only one per stack instance.
!          * Use atomic_cas_ptr() on this because I don't set it until
!          * KEYSOCK_HELLO comes down.
           * Paired up with the esp_pfkey_q is the esp_event, which will age SAs.
           */
          queue_t                 *esp_pfkey_q;
          timeout_id_t            esp_event;