fix compile

Author: hubgeter

be/src/io/fs/buffered_reader.h

@@ -157,6 +157,8 @@ class RangeCacheFileReader : public io::FileReader {
 
     bool closed() const override { return _closed; }
 
+    std::shared_ptr<io::FileSystem> fs() const override { return _inner_reader->fs(); }
+
 protected:
     Status read_at_impl(size_t offset, Slice result, size_t* bytes_read,
                         const IOContext* io_ctx) override;