6659 nvlist_free(NULL) is a no-op

*** 1320,1330 ****
          ASSERT(MUTEX_HELD(&cip->ci_lock));
  
          if (cip->ci_proxy_asru)
                  fmd_free(cip->ci_proxy_asru, sizeof (uint8_t) *
                      cip->ci_nsuspects);
-         if (cip->ci_diag_de)
                  nvlist_free(cip->ci_diag_de);
          if (cip->ci_diag_asru)
                  fmd_free(cip->ci_diag_asru, sizeof (uint8_t) *
                      cip->ci_nsuspects);
  
--- 1320,1329 ----
*** 2429,2439 ****
  void
  fmd_case_set_de_fmri(fmd_case_t *cp, nvlist_t *nvl)
  {
          fmd_case_impl_t *cip = (fmd_case_impl_t *)cp;
  
-         if (cip->ci_diag_de)
                  nvlist_free(cip->ci_diag_de);
          cip->ci_diag_de = nvl;
  }
  
  void
--- 2428,2437 ----