event: follow up to r1604347.

Don't leak the timer event when it is cancelled.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1604451 13f79535-47bb-0310-9956-ffa450edef68

server/mpm/event/event.c

@@ -1765,6 +1765,10 @@ static void * APR_THREAD_FUNC listener_thread(apr_thread_t * thd, void *dummy)
                     }
                     push_timer2worker(ep);
                 }
+                else {
+                    APR_RING_INSERT_TAIL(&timer_free_ring, ep, timer_event_t,
+                                         link);
+                }
             }
             else {
                 break;