Events: fixed "port_dissociate() failed" alerts with eventport. If an attempt is made to delete an event which was already reported, port_dissociate() returns an error. Fix is avoid doing anything if ev->active is not set. Possible alternative approach would be to avoid calling ngx_del_event() at all if ev->active is not set. This approach, however, will require something else to re-add the other event of the connection, since both read and write events are dissociated if an event is reported on a file descriptor. Currently ngx_eventport_del_event() re-associates write event if called to delete read event, and vice versa.

--- a/src/event/modules/ngx_eventport_module.c
+++ b/src/event/modules/ngx_eventport_module.c
@@ -399,7 +399,7 @@ ngx_eventport_del_event(ngx_event_t *ev,
             return NGX_ERROR;
         }
 
-    } else {
+    } else if (ev->active) {
         ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0,
                        "eventport del event: fd:%d", c->fd);