[NFC] Fix sign-compare warnings in math_brute_force (#1467)
[NFC] Fix sign-compare warnings in math_brute_force (#1467)

Signed-off-by: Sven van Haastregt <c87899f97800fb9ac456b806e5f84934b5e9c197@arm.com>
KhronosGroup/OpenCL-CTS,KhronosGroup/OpenCL-CTS,KhronosGroup/OpenCL-CTS,KhronosGroup/OpenCL-CTS