Expect expired arrival intervals to leave the load window

tests/test_stream_core.c

@@ -48,7 +48,7 @@ static void test_load(void) {
     CHECK(stream_load_poll(&load, 1500, 0, &snapshot) == STREAM_OK && snapshot.arrivals.bytes == snapshot.sent.bytes);
     CHECK(stream_load_add(&load, 3, 3900) == STREAM_OK); stream_load_changed(&load);
     CHECK(stream_load_poll(&load, 1700, 300, &snapshot) == STREAM_OK && snapshot.growth_rate == 0 && !snapshot.confirmed);
-    CHECK(stream_load_poll(&load, 13000, 300, &snapshot) == STREAM_OK && snapshot.input_rate == 390);
+    CHECK(stream_load_poll(&load, 13000, 300, &snapshot) == STREAM_OK && snapshot.input_rate == 0);
     struct stream_metric_snapshot input = {.lag_ms = UINT64_C(1) << 42, .blocks = UINT64_MAX, .late_blocks = 2, .stops = 3,
         .source_rate_bytes_sec = UINT64_C(1) << 40, .receive_rate_bytes_sec = 10000, .source_rate_valid = 1, .receive_rate_valid = 1, .stopped = 1};
     uint8_t wire[STREAM_METRIC_WIRE_SIZE]; stream_metric_write(wire, &input, 1);