tests: Fix unused variable warning

tests-clar/status/worktree.c

@@ -414,7 +414,6 @@ void test_status_worktree__issue_592_ignored_dirs_with_tracked_content(void)
 void test_status_worktree__cannot_retrieve_the_status_of_a_bare_repository(void)
 {
 	git_repository *repo;
-	int error;
 	unsigned int status = 0;
 
 	cl_git_pass(git_repository_open(&repo, cl_fixture("testrepo.git")));