kernel32: fix last error result on CreateFile

[Víctor Manuel Álvarez García]

Greetings,

If CreateFile is called with CREATE_ALWAYS or
OPEN_ALWAYS flags, and the file already exists, the
function should success but the result of GetLastError
after the call must be ERROR_ALREADY_EXISTS. Wine was
not not setting the proper error code and GetLastError
just returned ERROR_SUCCESS.

Wine is great, good work guys!

Here goes my contribution,

Victor Manuel Alvarez Garcia
plusvic at yahoo.com

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