libtomcrypt: Remove prng_state* NULL pointer check from ed25519_make_…

…key()

For the same reasons as in commit 2d7740f ("core: libtomcrypt:
Remove prng_state* NULL pointer check from x25519_make_key()"), remove
the NULL pointer check in ed25519_make_key().

Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>

core/lib/libtomcrypt/src/pk/ed25519/ed25519_make_key.c

@@ -20,7 +20,6 @@ int ed25519_make_key(prng_state *prng, int wprng, curve25519_key *key)
 {
    int err;
 
-   LTC_ARGCHK(prng != NULL);
    LTC_ARGCHK(key  != NULL);
 
    if ((err = tweetnacl_crypto_sign_keypair(prng, wprng, key->pub, key->priv)) != CRYPT_OK) {