Fix use-after-scope.

Bug: 215762197
Change-Id: Id535a3a4ee0aa6be19939145f8c0cc8303374518
diff --git a/payload_consumer/install_operation_executor_unittest.cc b/payload_consumer/install_operation_executor_unittest.cc
index 5b4bd6b..705d8f8 100644
--- a/payload_consumer/install_operation_executor_unittest.cc
+++ b/payload_consumer/install_operation_executor_unittest.cc
@@ -236,8 +236,9 @@
   PayloadGenerationConfig config{
       .version = PayloadVersion(kBrilloMajorPayloadVersion,
                                 kZucchiniMinorPayloadVersion)};
+  const FilesystemInterface::File empty;
   diff_utils::BestDiffGenerator best_diff_generator(
-      source_data_, target_data_, src_extents, dst_extents, {}, {}, config);
+      source_data_, target_data_, src_extents, dst_extents, empty, empty, config);
   std::vector<uint8_t> patch_data = target_data_;  // Fake the full operation
   AnnotatedOperation aop;
   // Zucchini is enabled only on files with certain extensions