[Stream] Removed unused meta data

Author: cboden

Buffer.php

@@ -20,16 +20,11 @@ class Buffer extends EventEmitter implements WritableStreamInterface
         'file'    => '',
         'line'    => 0,
     );
-    private $meta;
 
     public function __construct($stream, LoopInterface $loop)
     {
         $this->stream = $stream;
         $this->loop = $loop;
-
-        if (is_resource($stream)) {
-            $this->meta = stream_get_meta_data($stream);
-        }
     }
 
     public function isWritable()