torture: fix warning for SSH_KEYTYPE_ED25519

Signed-off-by: Jon Simons <jon@jonsimons.org>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>

tests/torture.c

@@ -514,6 +514,7 @@ static const char *torture_get_testkey_internal(enum ssh_keytypes_e type,
             return torture_ecdsa256_testkey_pub;
         }
         return torture_ecdsa256_testkey;
+    case SSH_KEYTYPE_ED25519:
     case SSH_KEYTYPE_RSA1:
     case SSH_KEYTYPE_UNKNOWN:
         return NULL;