message: Remove unused variable in AllowedDataTypes
diff: @@ -811,10 +811,8 @@ DataTypeSet AllowedDataTypes(const OpDef::AttrDef& attr_def) {
  return AllTypes();
  }
  uint32 dtype_mask = 0;
  - int counter = 0;
  for (int dtype : allowed_types) {
  dtype_mask |= 1u << dtype;
  - counter++;
  }
  return DataTypeSet(dtype_mask);
  }
  