Fix test

test/core/end2end/tests/request_response_with_trailing_metadata_and_payload.c

@@ -67,14 +67,10 @@ static gpr_timespec n_seconds_time(int n) {
 static gpr_timespec five_seconds_time(void) { return n_seconds_time(5); }
 
 static void drain_cq(grpc_completion_queue *cq) {
-  grpc_event *ev;
-  grpc_completion_type type;
+  grpc_event ev;
   do {
     ev = grpc_completion_queue_next(cq, five_seconds_time());
-    GPR_ASSERT(ev);
-    type = ev->type;
-    grpc_event_finish(ev);
-  } while (type != GRPC_QUEUE_SHUTDOWN);
+  } while (ev.type != GRPC_QUEUE_SHUTDOWN);
 }
 
 static void shutdown_server(grpc_end2end_test_fixture *f) {