lib/math: Add Kunit test suite for gcd()

Add a KUnit test suite for the gcd() function.
This test suite verifies the correctness of gcd() across various
scenarios, including edge cases.

Signed-off-

lib/math: Add Kunit test suite for gcd()

Add a KUnit test suite for the gcd() function.
This test suite verifies the correctness of gcd() across various
scenarios, including edge cases.

Signed-off-by: Yu-Chun Lin <[email protected]>
Reviewed-by: Kuan-Wei Chiu <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Kees Cook <[email protected]>

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