wininet: Fix invalid memory access in HTTP_QUERY_RAW_HEADERS (Valgrind).

[Sebastian Lackner]

Fixes https://bugs.winehq.org/show_bug.cgi?id=36641

---
 dlls/wininet/http.c       |    4 ++--
 dlls/wininet/tests/http.c |   32 ++++++++++++++++++++++++++++++++
 2 files changed, 34 insertions(+), 2 deletions(-)
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