winhttp: Don't try and call a null callback

[Paul TBBle Hampson]

Between this patch and "winhttp: Correctly parse specified ports in
WinHttpCrackUrl", the Warhammer Online patch client (warpatch.bin)
operates successfully using builtin winhttp.
-- 
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Paul "TBBle" Hampson, B.Sc, LPI, MCSE
Very-later-year Asian Studies student, ANU
The Boss, Bubblesworth Pty Ltd (ABN: 51 095 284 361)
Paul.Hampson at Pobox.com

Of course Pacman didn't influence us as kids. If it did,
we'd be running around in darkened rooms, popping pills and
listening to repetitive music.
 -- Kristian Wilson, Nintendo, Inc, 1989

License: http://creativecommons.org/licenses/by/2.5/au/
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