CheckerOperationsImpl: Remove unused try-with-resources variables

Change-Id: I8ca3b7b28d26b18709f3e6d0069cf736e8cd66f6
diff --git a/java/com/google/gerrit/plugins/checks/acceptance/testsuite/CheckerOperationsImpl.java b/java/com/google/gerrit/plugins/checks/acceptance/testsuite/CheckerOperationsImpl.java
index fe4d54f..dc1fe68 100644
--- a/java/com/google/gerrit/plugins/checks/acceptance/testsuite/CheckerOperationsImpl.java
+++ b/java/com/google/gerrit/plugins/checks/acceptance/testsuite/CheckerOperationsImpl.java
@@ -212,9 +212,7 @@
       Optional<Checker> checker = getChecker(checkerUuid);
       checkState(checker.isPresent(), "Tried to get config text for a non-existing test checker");
 
-      try (Repository repo = repoManager.openRepository(allProjectsName);
-          RevWalk rw = new RevWalk(repo);
-          ObjectReader or = repo.newObjectReader()) {
+      try (Repository repo = repoManager.openRepository(allProjectsName)) {
         // Parse as Config to ensure it's a valid config file.
         return new BlobBasedConfig(
                 null, repo, checker.get().getRefState(), CheckerConfig.CHECKER_CONFIG_FILE)