Remove unused code.

Scrutinizer was helpful in finding these.

src/Cache/Engine/RedisEngine.php

@@ -92,11 +92,6 @@ class RedisEngine extends CacheEngine
     protected function _connect()
     {
         try {
-            $server = $this->_config['host'];
-            if (empty($server) && !empty($this->_config['server'])) {
-                $server = $this->_config['server'];
-            }
-
             $this->_Redis = new \Redis();
             if (!empty($this->settings['unix_socket'])) {
                 $return = $this->_Redis->connect($this->settings['unix_socket']);

src/Controller/Component/RequestHandlerComponent.php

@@ -535,7 +535,6 @@ class RequestHandlerComponent extends Component
     public function renderAs(Controller $controller, $type, array $options = [])
     {
         $defaults = ['charset' => 'UTF-8'];
-        $view = null;
         $viewClassMap = $this->viewClassMap();
 
         if (Configure::read('App.encoding') !== null) {

src/Database/Expression/TupleComparison.php

@@ -92,7 +92,7 @@ class TupleComparison extends Comparison
 
             $type = $this->_type;
             $multiType = is_array($type);
-            $isMulti = $this->isMulti($i, $type);
+            $isMulti = $this->isMulti();
             $type = $multiType ? $type : str_replace('[]', '', $type);
             $type = $type ?: null;