Remove the unused INVALID_PTHREAD_KEY (#2930)

chenBright · web-flow · commit ab66887755eb · 2025-03-31T10:27:31.000+08:00
diff --git a/src/butil/containers/doubly_buffered_data.h b/src/butil/containers/doubly_buffered_data.h
@@ -174,8 +174,6 @@ class DoublyBufferedData {
     pthread_mutex_t _modify_mutex{};
 };
 
-static const pthread_key_t INVALID_PTHREAD_KEY = (pthread_key_t)-1;
-
 template <typename T, typename TLS>
 class DoublyBufferedDataWrapperBase {
 public:
