wininet: Don't update *lpdwIndex if HttpQueryInfoW fails with ERROR_INSUFFICIENT_BUFFER.

[Sebastian Lackner]

Fixes http://bugs.winehq.org/show_bug.cgi?id=20497

HttpQueryInfo* shouldn't update *lpdwIndex if the error code is
ERROR_INSUFFICIENT_BUFFER. The application Smilebox doesn't reset
*lpdwIndex between consecutive calls, and thus fails to find the
required header fields.

---
 dlls/wininet/http.c       |    3 +--
 dlls/wininet/tests/http.c |   17 +++++++++++++++--
 2 files changed, 16 insertions(+), 4 deletions(-)
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