wininet: InternetCrackUrlW: for URLs that have no urlpath, native clears lpszUrlPath

[Dan Kegel]

Found by Valgrind.

Add one more URL to the InternetCrackUrlW test case,
fix the bug that confirms.
After the fix, tests pass on both XP and Wine.

I believe winex committed a similar fix in 2005,
http://lists.transgaming.org/pipermail/winex-devel/2005-March/000504.html

Here are the valgrind errors this fixes:

With WINEDEBUG=+wininet:

trace:wininet:InternetCrackUrlW L"http://www.winehq.org":
scheme(L"http") host(L"www.winehq.org") path(L"") extra(L"")
...
Conditional jump or move depends on uninitialised value(s)
    by debugstr_w (debug.h:260)
    by HttpOpenRequestW (http.c:914)
    by INTERNET_InternetOpenUrlW (internet.c:2813)
    by AsyncInternetOpenUrlProc (internet.c:2855)
    by INTERNET_WorkerThreadFunc (internet.c:3044)
  Uninitialised value was created by a stack allocation
    at INTERNET_InternetOpenUrlW (internet.c:2743)


With or without WINEDEBUG=+wininet:

 Conditional jump or move depends on uninitialised value(s)
    at HTTP_HttpOpenRequestW (http.c:1931)
    by HttpOpenRequestW (http.c:939)
    by INTERNET_InternetOpenUrlW (internet.c:2813)
    by AsyncInternetOpenUrlProc (internet.c:2855)
    by INTERNET_WorkerThreadFunc (internet.c:3044)
  Uninitialised value was created by a stack allocation
    at  INTERNET_InternetOpenUrlW (internet.c:2743)

(This was nearby
http://bugs.winehq.com/show_bug.cgi?id=1805
too bad it wasn't caught at the same time.)
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