fix(crypto/test): fix uninitialized variable use

tests/test_speed.c:61:3: error: ‘sk’ may be used uninitialized [-Werror=maybe-uninitialized]
   61 |   ed25519_publickey(sk, pk);
tests/test_speed.c:145:3: error: ‘sk’ may be used uninitialized [-Werror=maybe-uninitialized]
  145 |   ed25519_publickey(sk, pk);

crypto/tests/test_speed.c

@@ -54,7 +54,7 @@ void bench_sign_ed25519(int iterations) {
   ed25519_secret_key sk;
   ed25519_signature sig;
 
-  memcpy(pk,
+  memcpy(sk,
          "\xc5\x5e\xce\x85\x8b\x0d\xdd\x52\x63\xf9\x68\x10\xfe\x14\x43\x7c\xd3"
          "\xb5\xe1\xfb\xd7\xc6\xa2\xec\x1e\x03\x1f\x05\xe8\x6d\x8b\xd5",
          32);
@@ -138,7 +138,7 @@ void bench_verify_ed25519(int iterations) {
   ed25519_secret_key sk;
   ed25519_signature sig;
 
-  memcpy(pk,
+  memcpy(sk,
          "\xc5\x5e\xce\x85\x8b\x0d\xdd\x52\x63\xf9\x68\x10\xfe\x14\x43\x7c\xd3"
          "\xb5\xe1\xfb\xd7\xc6\xa2\xec\x1e\x03\x1f\x05\xe8\x6d\x8b\xd5",
          32);