[PATCH] GetPrivateProfileString should set buffer to "" if default value is not set

[Christopher Smith]

Our existing tests for GetPrivateProfileString were not checking to see 
if strings were null terminated, and in particular, the case where 
lpDefault wasn't set, the code actually *didn't* set the target buffer 
to an empty string as it should. Valgrind noticed this problem, but the 
unit tests didn't, so I've updated the unit tests to add this test *and* 
fixed the relevant code to GetPrivateProfileString. Please find the 
patch attached.

--Chris
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