Fix crash in WritePrivateProfileString

[Thomas Charbonnel]

Hi,

This fixes a crash in WritePrivateProfileString when the lpFileName
parameter was NULL. The behaviour is modeled after what I tested on
Windows machines: 9x/Me returns FALSE and nothing is done, NT/2K/XP
attempts to write the entry in the win.ini file and returns the
appropriate value.

Thomas


Changelog:
    Thomas Charbonnel <thomas at undata.org>
    Fix crash in WritePrivateProfileString


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