Fix Win16 GetPrivateProfileString regression

[Richard Cohen]

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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