Unlike CEE, IEEE has a bespoke app delete call and does not rely on priority
for app deletion
Fixes : 
2376c879b80c ('cxgb4 : Improve handling of DCB negotiation or loss
 thereof')
Signed-off-by: Anish Bhatt <anish@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
                app.protocol = dcb->app_priority[i].protocolid;
 
                if (dcb->dcb_version == FW_PORT_DCB_VER_IEEE) {
+                       app.priority = dcb->app_priority[i].user_prio_map;
                        app.selector = dcb->app_priority[i].sel_field + 1;
-                       err = dcb_ieee_setapp(dev, &app);
+                       err = dcb_ieee_delapp(dev, &app);
                } else {
                        app.selector = !!(dcb->app_priority[i].sel_field);
                        err = dcb_setapp(dev, &app);