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/pluggable.php

@@ -105,7 +105,7 @@ if ( ! function_exists( 'get_user_by' ) ) :
 			return false;
 		}
 
-		$user = new WP_User;
+		$user = new WP_User();
 		$user->init( $userdata );
 
 		return $user;