Removed dead statement.

src/Composer/Util/RemoteFilesystem.php

@@ -229,7 +229,6 @@ class RemoteFilesystem
                 }
 
                 throw new TransportException('The "'.$this->fileUrl.'" file could not be downloaded ('.trim($message).')', $messageCode);
-                break;
 
             case STREAM_NOTIFY_AUTH_RESULT:
                 if (403 === $messageCode) {