6752 E_SUPPRESSION_DIRECTIVE_UNUSED lint warnings on SPARC build

*** 1863,1873 ****
  static void
  usbser_thr_dispatch(usbser_thread_t *thr)
  {
          usbser_port_t   *pp = thr->thr_port;
          usbser_state_t  *usp = pp->port_usp;
-         /*LINTED E_FUNC_SET_NOT_USED*/
          int             rval;
  
          ASSERT(mutex_owned(&pp->port_mutex));
          ASSERT((thr->thr_flags & USBSER_THR_RUNNING) == 0);
  
--- 1863,1872 ----