[swfmill] [patch] fix some bad manners.

[Ralf Fuest]

Thanks for your patch. I've applied it to the svn.

Ralf

> This patch fixes following bugs. (not effect to behavior)
>  1. SWF::File leaks memory when destructed.
>  2. SWFReader::getData() doesn't return a value.
> 
> ---
> Sorry about my poor English.
> INADA Naoki  <inada-n at klab.org>
>                     KLab Inc.