Coding Standards: Always use parentheses when instantiating an object.

Note: This will be enforced by WPCS 3.0.0.

Props jrf.
See #56791.

git-svn-id: https://develop.svn.wordpress.org/trunk@54891 602fd350-edb4-49c9-b593-d223f7449a82

tests/phpunit/tests/meta.php

@@ -401,7 +401,7 @@ class Tests_Meta extends WP_UnitTestCase {
 	 * @ticket 15030
 	 */
 	public function test_get_metadata_with_empty_key_object_value() {
-		$data      = new stdClass;
+		$data      = new stdClass();
 		$data->foo = 'bar';
 		$value     = serialize( $data );
 		add_metadata( 'user', $this->author->ID, 'foo', $data );