user/tests: 0 is not a window handle, says IsWindow(0).

[Joerg-Cyril.Hoehle at t-systems.com]

Hi,

you decide whether these 3 tests are worth a git entry.

I missed the answer while involved with winmm:DriverCallback 0 CALLBACK_WINDOW.

Generally, Valgrind proves valuable when testing boundary cases.

Regards,
 Jörg Höhle
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