wininet: Don't peek data in InternetQueryDataAvailable if there is no more to be expected.

[Misha Koshelev]

Too bad this did not make it in time for 0.9.43 but I just noticed the problem when I was trying to install
ie6setup and it would just hang. It turns out that recv() with MSG_PEEK just seems to block indefinitely
at least on the microsoft.com URL for iexplorer download sites when we try to read more data than is
expected from the content length (whereas no problems were encountered with any of the winehq/codeweavers 
and invitrogen sites, go figure).
---
 dlls/wininet/internet.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
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