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

src/wp-includes/capabilities.php

@@ -975,7 +975,7 @@ function user_can( $user, $capability, ...$args ) {
 	if ( empty( $user ) ) {
 		// User is logged out, create anonymous user object.
 		$user = new WP_User( 0 );
-		$user->init( new stdClass );
+		$user->init( new stdClass() );
 	}
 
 	return $user->has_cap( $capability, ...$args );