[RESEND] Fix Win16 GetPrivateProfileString regression

[Richard Cohen]

Rediffed against current CVS.

Richard Cohen wrote:
> http://www.winehq.com/hypermail/wine-cvs/2005/03/0021.html
> 
> Rein Klazes <wijn at wanadoo.nl>
> When enumerating keys using Get(Private)ProfileString do not include
> lines without an '=' character. Added a test that shows the behavior.
> 
> caused a regression in 16bit installers using MSTEST.
> 
> MSTEST checks if a section exists by calling 
> GetPrivateProfileString(section, NULL, ..., common.inf)
> and none of the keys contains an =.
> 
> Richard.
> 
> 
> Changelog
> - Fix regression in GetPrivateProfileString16 for key=NULL.
> - Check return values in Profile tests.
> 
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