replay: fix hanging on exit if stream thread has not been started yet (#22770)

selfdrive/ui/replay/filereader.cc

@@ -18,7 +18,7 @@ std::string cacheFilePath(const std::string &url) {
     return comma_cache.back() == '/' ? comma_cache : comma_cache + "/";
   }();
 
-  return cache_path + sha256(getUrlWithoutQuery(url));;
+  return cache_path + sha256(getUrlWithoutQuery(url));
 }
 
 std::string FileReader::read(const std::string &file, std::atomic<bool> *abort) {

selfdrive/ui/replay/framereader.cc

@@ -44,7 +44,6 @@ FrameReader::FrameReader(bool local_cache, int chunk_size, int retries) : FileRe
   av_frame_ = av_frame_alloc();
   rgb_frame_ = av_frame_alloc();
   yuv_frame_ = av_frame_alloc();;
-
 }
 
 FrameReader::~FrameReader() {

selfdrive/ui/replay/replay.cc

@@ -41,15 +41,16 @@ Replay::~Replay() {
 }
 
 void Replay::stop() {
-  if (stream_thread_ == nullptr) return;
+  if (!stream_thread_ && segments_.empty()) return;
 
   qDebug() << "shutdown: in progress...";
-  exit_ = updating_events_ = true;
-  stream_cv_.notify_one();
-  stream_thread_->quit();
-  stream_thread_->wait();
-  stream_thread_ = nullptr;
-
+  if (stream_thread_ != nullptr) {
+    exit_ = updating_events_ = true;
+    stream_cv_.notify_one();
+    stream_thread_->quit();
+    stream_thread_->wait();
+    stream_thread_ = nullptr;
+  }
   segments_.clear();
   camera_server_.reset(nullptr);
   qDebug() << "shutdown: done";