Mencegah auth login setelah registration Laravel 5.2

AuthController.php

<?php

// FOCUS pada fungsi register()

namespace App\Http\Controllers\Auth;

use App\User;
use Validator;
use Illuminate\Http\Request;
use App\Http\Controllers\Controller;
use Illuminate\Foundation\Auth\ThrottlesLogins;
use Illuminate\Foundation\Auth\AuthenticatesAndRegistersUsers;

class AuthController extends Controller
{
    /*
    |--------------------------------------------------------------------------
    | Registration & Login Controller
    |--------------------------------------------------------------------------
    |
    | This controller handles the registration of new users, as well as the
    | authentication of existing users. By default, this controller uses
    | a simple trait to add these behaviors. Why don't you explore it?
    |
    */

    use AuthenticatesAndRegistersUsers , ThrottlesLogins;

    /**
     * Where to redirect users after login / registration.
     *
     * @var string
     */
    protected $redirectTo = '/admin';

    /**
     * Where to redirect users after logout.
     *
     * @var string
     */
    protected $redirectAfterLogout = '/login';

    /**
     * Create a new authentication controller instance.
     *
     * @return void
     */
    public function __construct()
    {
        $this->middleware('guest', ['only' => ['login']]);
    }

    /**
     * Get a validator for an incoming registration request.
     *
     * @param  array  $data
     * @return \Illuminate\Contracts\Validation\Validator
     */
    protected function validator(array $data)
    {
        return Validator::make($data, [
            'name' => 'required|max:255',
            'email' => 'required|email|max:255|unique:users',
            'password' => 'required|confirmed|min:6',
        ]);
    }

    /**
     * Create a new user instance after a valid registration.
     *
     * @param  array  $data
     * @return User
     */
    protected function create(array $data)
    {
        return User::create([
            'name' => $data['name'],
            'email' => $data['email'],
            'password' => bcrypt($data['password']),
        ]);
    }
    
    /**
     * fungsi ini override dari 'register()'
     * yang ada pada traits 'Illuminate\Foundation\Auth\AuthenticatesAndRegistersUsers'
     */
    public function register(Request $request)
    {
        $validator = $this->validator($request->all());
        if ($validator->fails()) {
            $this->throwValidationException(
                $request, $validator
            );
        }

        $this->create($request->all());

        return redirect($this->redirectPath());
    }
}