6659 nvlist_free(NULL) is a no-op

*** 179,189 ****
  free_notify_prefs(fmd_hdl_t *hdl, nvlist_t **prefs, uint_t nprefs)
  {
          int i;
  
          for (i = 0; i < nprefs; i++) {
-                 if (prefs[i])
                          nvlist_free(prefs[i]);
          }
  
          fmd_hdl_free(hdl, prefs, sizeof (nvlist_t *) * nprefs);
  }
--- 179,188 ----