[AD] src/dos/wss.c fix

[Marcio F. <maa...@ya...>]

The file src/dos/wss.c had a problem which caused GCC to issue a warning 
when compiling it (see attached file wss_warning.txt).
Following the suggestion given by Elias Pschernig, in the following 
thread ( 
http://sourceforge.net/mailarchive/forum.php?thread_id=6326719&forum_id=34598 
). I could sucessfully fix it.

Basically I've changed the declaration of "wss_dma_addr" from "static 
int" to "static long", and I removed a cast in the line 282.

I hope this doesn't introduce any side effects in the code.

:-)
Marcio.