Unintended unboxing of potential null pointer in AutoValue_HDFSFileSource

      if (validateSource == null) {
        missing += " validateSource";
      }
...
      return new AutoValue_HDFSFileSource<T, K, V>(
          this.filepattern,
          this.formatClass,
          this.coder,
          this.inputConverter,
          this.serializableConfiguration,
          this.serializableSplit,
          this.username,
          this.validateSource);