fixup! fix missing return statement

src/field_factory.inl

@@ -35,9 +35,11 @@ inline Field_t FieldFactory::reInit(Field_t& field, const CdoVar& var) {
       // The type has changed
       return FieldFactory::init(var);
   } else if (var.memType == MemType::Double &&  std::holds_alternative<FieldDouble>(field)) {
-    return std::get<FieldDouble>(field).resize(var.gridsize * var.nwpv);
+    std::get<FieldDouble>(field).resize(var.gridsize * var.nwpv);
+    return field;
   } else  if (var.memType == MemType::Float &&  std::holds_alternative<FieldFloat>(field)) {
-    return std::get<FieldFloat>(field).resize(var.gridsize * var.nwpv);
+    std::get<FieldFloat>(field).resize(var.gridsize * var.nwpv);
+    return field;
   } else {
     throw std::runtime_error("Not supported type");
   }