5047 don't use atomic_*_nv if you discard the return value

*** 1418,1439 ****
  cmi_hdl_rele(cmi_hdl_t ophdl)
  {
          cmi_hdl_impl_t *hdl = IMPLHDL(ophdl);
  
          ASSERT(*hdl->cmih_refcntp > 0);
!         (void) atomic_dec_32_nv(hdl->cmih_refcntp);
  }
  
  void
  cmi_hdl_destroy(cmi_hdl_t ophdl)
  {
          cmi_hdl_impl_t *hdl = IMPLHDL(ophdl);
          cmi_hdl_ent_t *ent;
  
          /* Release the reference count held by cmi_hdl_create(). */
          ASSERT(*hdl->cmih_refcntp > 0);
!         (void) atomic_dec_32_nv(hdl->cmih_refcntp);
          hdl->cmih_flags |= CMIH_F_DEAD;
  
          ent = cmi_hdl_ent_lookup(hdl->cmih_chipid, hdl->cmih_coreid,
              hdl->cmih_strandid);
          /*
--- 1418,1439 ----
  cmi_hdl_rele(cmi_hdl_t ophdl)
  {
          cmi_hdl_impl_t *hdl = IMPLHDL(ophdl);
  
          ASSERT(*hdl->cmih_refcntp > 0);
!         atomic_dec_32(hdl->cmih_refcntp);
  }
  
  void
  cmi_hdl_destroy(cmi_hdl_t ophdl)
  {
          cmi_hdl_impl_t *hdl = IMPLHDL(ophdl);
          cmi_hdl_ent_t *ent;
  
          /* Release the reference count held by cmi_hdl_create(). */
          ASSERT(*hdl->cmih_refcntp > 0);
!         atomic_dec_32(hdl->cmih_refcntp);
          hdl->cmih_flags |= CMIH_F_DEAD;
  
          ent = cmi_hdl_ent_lookup(hdl->cmih_chipid, hdl->cmih_coreid,
              hdl->cmih_strandid);
          /*