Add missing PKCS11_OBJECT reference

Author: mtrojnar

src/p11_key.c

@@ -1,6 +1,6 @@
 /* libp11, a simple layer on to of PKCS#11 API
  * Copyright (C) 2005 Olaf Kirch <[email protected]>
- * Copyright (C) 2016-2018 Michał Trojnara <[email protected]>
+ * Copyright (C) 2016-2024 Michał Trojnara <[email protected]>
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Lesser General Public
@@ -507,11 +507,10 @@ EVP_PKEY *pkcs11_get_key(PKCS11_OBJECT_private *key0, CK_OBJECT_CLASS object_cla
 			pkcs11_set_ex_data_ec(ec_key, NULL);
 #else
 		ret = EVP_PKEY_dup(key->evp_key);
-		if (key->object_class != CKO_PRIVATE_KEY) {
-			/* Public key -> detach and free PKCS11_OBJECT */
+		if (key->object_class == CKO_PRIVATE_KEY)
+			pkcs11_object_ref(key);
+		else /* Public key -> detach PKCS11_OBJECT */
 			pkcs11_set_ex_data_ec((EC_KEY *)EVP_PKEY_get0_EC_KEY(ret), NULL);
-			pkcs11_object_free(key);
-		}
 #endif
 		break;
 	default: