[Bug 40136] directx.c:4425:5: warning: comparison of unsigned expression < 0 is always false

https://bugs.winehq.org/show_bug.cgi?id=40136

--- Comment #3 from Nikolay Sivov  ---
Why is that wrong? Function validates its argument, which can be anything.
Whether enum integer type is signed or not is compiler specific, for gcc and
this particular enum it will be unsigned int most likely, so more reliable
check would be to use (unsigned int)multisample_type >
WINED3D_MULTISAMPLE_16_SAMPLES.