Apply suggestions from code review

Author: Edward Thomson

src/worktree.c

@@ -262,7 +262,7 @@ int git_worktree_validate(const git_worktree *wt)
 
 	if (!git_path_exists(wt->worktree_path)) {
 		git_error_set(GIT_ERROR_WORKTREE,
-			"worktree directory ('%s') does not exist ",
+			"worktree directory '%s' does not exist",
 			wt->worktree_path);
 		return GIT_ERROR;
 	}

tests/worktree/worktree.c

@@ -618,6 +618,7 @@ void test_worktree_worktree__validate_invalid_worktreedir(void)
 	cl_git_pass(git_worktree_lookup(&wt, fixture.repo, "testrepo-worktree"));
 	p_rename("testrepo-worktree", "testrepo-worktree-tmp");
 	cl_git_fail(git_worktree_validate(wt));
+	p_rename("testrepo-worktree-tmp", "testrepo-worktree");
 
 	git_worktree_free(wt);
 }

tests/worktree/worktree_helpers.c

@@ -19,7 +19,6 @@ void cleanup_fixture_worktree(worktree_fixture *fixture)
 		cl_fixture_cleanup(fixture->reponame);
 	if (fixture->worktreename)
 		cl_fixture_cleanup(fixture->worktreename);
-	p_rename("testrepo-worktree-tmp", "testrepo-worktree");
 }
 
 void setup_fixture_worktree(worktree_fixture *fixture)