5045 use atomic_{inc,dec}_* instead of atomic_add_*

@@ -456,11 +456,11 @@
         if (instance != -1) {
                 (void) snprintf(tq_name, sizeof (tq_name),
                     "USB_%s_%x_pipehndl_tq_%d",
                     ddi_driver_name(dip), ep->bEndpointAddress, instance);
         } else {
-                def_instance = atomic_add_32_nv(&anon_instance, 1);
+                def_instance = atomic_inc_32_nv(&anon_instance);
 
                 (void) snprintf(tq_name, sizeof (tq_name),
                     "USB_%s_%x_pipehndl_tq_%d_",
                     ddi_driver_name(dip), ep->bEndpointAddress, def_instance);
         }