dpnet/tests: Avoid casting return value of HeapAlloc calls

[Frédéric Delanoy]

On Fri, Oct 21, 2011 at 02:13, Marvin <testbot at testbot.winehq.org> wrote:
> Hi,
>
> While running your changed tests on Windows, I think I found new failures.
> Being a bot and all I'm not very good at pattern recognition, so I might be
> wrong, but could you please double-check?
> Full results can be found at
> http://testbot.winehq.org/JobDetails.pl?Key=15042
>
> Your paranoid android.
>
>
> === WNT4WSSP6 (32 bit peer) ===
> peer.c:52: Test failed: CoCreateInstance failed with 0x80040154
> peer: unhandled exception c0000005 at 004013BF
>
> === W2KPROSP4 (32 bit peer) ===
> peer.c:52: Test failed: CoCreateInstance failed with 0x80040154
> peer: unhandled exception c0000005 at 004013BF

This also happens when you send a comment-only patch to testbot. Flaky test?