Update current_size_ to 0 in after of truncating in rotation error

include/spdlog/sinks/rotating_file_sink.h

@@ -105,6 +105,7 @@ private:
                 if (!rename_file(src, target))
                 {
                     file_helper_.reopen(true); // truncate the log file anyway to prevent it to grow beyond its limit!
+                    current_size_ = 0;
                     throw spdlog_ex(
                         "rotating_file_sink: failed renaming " + filename_to_str(src) + " to " + filename_to_str(target), errno);
                 }