Allow membership closure to finish before releasing restored stream handle

tests/test_stream_service.c

@@ -2036,10 +2036,10 @@ static void test_member_lifecycle(void) {
     CHECK(stream_get_info(other, &restarted) == STREAM_OK && restarted.buffer.blocks > 0);
     CHECK(member_owner_update(1, 1, 1001, 0, 0) >= 0);
     CHECK(!stream_handle_active(reader));
-    stream_close(reader); reader = NULL;
     uint64_t ready_deadline = get_time_tb() + 100000;
     while (!stream_member_online(nodes[1], GROUP1, nodes[0]->node_id) && get_time_tb() < ready_deadline) test_clock_poll(ua, 100);
     CHECK(stream_member_online(nodes[1], GROUP1, nodes[0]->node_id));
+    stream_close(reader); reader = NULL;
     CHECK(stream_subscribe_manual_open(nodes[1], GROUP1, nodes[0]->node_id, &reader) == STREAM_OK);
     DEBUG_INFO(DEBUG_CATEGORY_STREAM, "[PASS] own removal: channel closes/new open denied, other channel writes, "
                "higher owner version restores new open");