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

@@ -1418,22 +1418,22 @@
 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);
+        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);
-        (void) atomic_dec_32_nv(hdl->cmih_refcntp);
+        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);
         /*