A different approach of signed-to-unsigned comparison
A different approach of signed-to-unsigned comparison

Suggsted by @hanno-arm

Signed-off-by: makise-homura <696b3a2c906cfb7f981b1719612c7d6b995e283a@kurisa.ch>

Mbed-TLS/mbedtls,Mbed-TLS/mbedtls,ARMmbed/mbedtls,ARMmbed/mbedtls,ARMmbed/mbedtls,NXPmicro/mbedtls,ARMmbed/mbedtls,Mbed-TLS/mbedtls,NXPmicro/mbedtls,NXPmicro/mbedtls,NXPmicro/mbedtls,Mbed-TLS/mbedtls