Fix closing socket

Author: clue

Datagram/Socket.php

@@ -92,9 +92,9 @@ public function close()
         $this->emit('close', array($this));
         $this->pause();
 
+        fclose($this->socket);
         $this->socket = false;
         $this->buffer->close();
-        fclose($this->socket);
 
         $this->removeAllListeners();
     }