Eliminate casts of the return value of HeapAlloc

[Mike McCormack]

Dimitrie O. Paun wrote:

> Yeah, it's so straightforward, we should just do it.
> However, I don't think we should sed it, most places
> require human touch to maintain sane formatting.

Well, it's always nice to leave some entry level tasks behind for people 
who want to start working on Wine.  They're really easy to do, but by 
writing the patch, and submitting it, newcomers can learn alot about the 
patch submission process.

Mike