[Bug 38337] clang compiling warnings

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=38337

--- Comment #12 from Sergey Isakov <isakov-sl at bk.ru> ---
/Volumes/MacHD/Users/sergey/Documents/Projects/winehq/dlls/d3d12/tests/d3d12.c:28:9:
warning: 
      taking the absolute value of unsigned type 'unsigned int' has no effect
[-Wabsolute-value]
    if (abs((c1 & 0xff) - (c2 & 0xff)) > max_diff)
        ^
/Volumes/MacHD/Users/sergey/Documents/Projects/winehq/dlls/d3d12/tests/d3d12.c:28:9:
note: remove
      the call to 'abs' since unsigned values cannot be negative
    if (abs((c1 & 0xff) - (c2 & 0xff)) > max_diff)
        ^~~
/Volumes/MacHD/Users/sergey/Documents/Projects/winehq/dlls/d3d12/tests/d3d12.c:31:9:
warning: 
      taking the absolute value of unsigned type 'unsigned int' has no effect
[-Wabsolute-value]
    if (abs((c1 & 0xff) - (c2 & 0xff)) > max_diff)
        ^
/Volumes/MacHD/Users/sergey/Documents/Projects/winehq/dlls/d3d12/tests/d3d12.c:31:9:
note: remove
      the call to 'abs' since unsigned values cannot be negative
    if (abs((c1 & 0xff) - (c2 & 0xff)) > max_diff)
        ^~~

------------------------
as said before there must be cast to singed int.

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