fixup! add ublk-nop example

Author: wokron

examples/nop.cpp

@@ -58,8 +58,9 @@ ex::task<void> wait_signal(int ctrl_fd, int signal_fd, uint32_t dev_id,
                            ex::inplace_stop_source &source) {
     std::println("ublk-nop: ublk device {} is running...", dev_id);
     auto parent_token = co_await ex::read_env(ex::get_stop_token);
-    ex::inplace_stop_callback cb{parent_token,
-                                 [&] noexcept { source.request_stop(); }};
+    auto stop_request = [&] noexcept { source.request_stop(); };
+    ex::inplace_stop_callback<decltype(stop_request)> cb{
+        parent_token, std::move(stop_request)};
     signalfd_siginfo si;
     co_await (condy::async_read(signal_fd, condy::buffer(&si, sizeof(si)), 0) |
               ex::write_env(ex::prop{ex::get_stop_token, source.get_token()}));