LibJS: Convert prepare_temporal_fields() to ThrowCompletionOr

Author: https://github.com/linusg
Commit: 6b4777c558
Pull-request: https://github.com/SerenityOS/serenity/pull/10065
Reviewed-by: https://github.com/IdanHo ✅

Userland/Libraries/LibJS/Runtime/Temporal/PlainMonthDay.cpp

@@ -103,9 +103,7 @@ ThrowCompletionOr<PlainMonthDay*> to_temporal_month_day(GlobalObject& global_obj
             return throw_completion(exception->value());
 
         // e. Let fields be ? PrepareTemporalFields(item, fieldNames, «»).
-        auto* fields = prepare_temporal_fields(global_object, item_object, field_names, {});
-        if (auto* exception = vm.exception())
-            return throw_completion(exception->value());
+        auto* fields = TRY(prepare_temporal_fields(global_object, item_object, field_names, {}));
 
         // f. Let month be ? Get(fields, "month").
         auto month = fields->get(vm.names.month);