ntdll: Set the file_part for \\?\ long file names too

[James Hawkins]

Hi,

This patch fixes a crash when trying to run the True Image installer. 
The installer calls FindFirstFileExW with a \\?\ long file name, which
in turn calls RtlDosPathNameToNtPathName_U with the same file.  The
returned mask is never set, so trying to read from it causes a crash.

Changelog
* Set the file_part for \\?\ long file names too.

--
James Hawkins
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