tests:kem: Don't emit a message each time, but once.
* tests/t-kem.c (test_kem_sntrup761, test_kem_mceliece6688128f) (test_kem_mlkem512, test_kem_mlkem768, test_kem_mlkem1024): Don't emit message here. (check_kem): But here, before the loop.
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>