patch: fix WSARecv invocation; report WSA errors

[Marc Lehmann]

On Sat, May 12, 2012 at 01:43:22AM +0400, Denis Bilenko <denis.bilenko at gmail.com> wrote:
> WSARecv() sometimes fails with WSAEFAULT if lpFlags parameter is zero.
> See comment at the end of this page:
> http://msdn.microsoft.com/en-us/library/windows/desktop/ms741688%28v=vs.85%29.aspx

Thanks a lot, should be fixed in CVS.

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