[4/4] ws2_32: Avoid a crash with an optional pointer in WSAAsyncGetServByName.

[Marvin]

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=11362

Your paranoid android.


=== WXPPROSP3 (32 bit sock) ===
sock.c:501: Test failed: oob_server (218): unexpectedly at the OOB mark: 0
sock.c:511: Test failed: oob_server (218): unexpectedly at the OOB mark: 0