fixup! crypto: support SLH-DSA KeyObject, sign, and verify

Author: panva

deps/ncrypto/ncrypto.cc

@@ -1997,7 +1997,12 @@ int EVPKeyPointer::id(const EVP_PKEY* key) {
   if (key == nullptr) return 0;
   int type = EVP_PKEY_id(key);
 #if OPENSSL_WITH_PQC
+  // EVP_PKEY_id returns -1 when EVP_PKEY_* is only implemented in a provider
+  // which is the case for all post-quantum NIST algorithms
+  // one suggested way would be to use a chain of `EVP_PKEY_is_a`
   // https://github.com/openssl/openssl/issues/27738#issuecomment-3013215870
+  // or, this way there are less calls to the OpenSSL provider, just
+  // getting the name once
   if (type == -1) {
     const char* type_name = EVP_PKEY_get0_type_name(key);
     if (type_name == nullptr) return -1;