shlwapi: If the URL_UNESCAPE_INPLACE is set, UrlUnEscape should not fail if pcchUnescaped buffer is NULL

[Louis. Lenders]

Hi, this makes the Google Lively installer start downloading the installation files, instead of just hanging and timing out.

Tests show that if the bufferpointer pcchUnescaped = NULL, UrlUnEscape fails, but if the URL_UNESCAPE_INPLACE flag is set (and the bufferpointer is 0), it just returns S_OK, and the conversion is done just fine. 

I'll send the tests later-on, they still look rather ugly to me, i'll attach them to bug http://bugs.winehq.org/show_bug.cgi?id=14381 for now.


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