Latest update (add quic)

crypto/engine/eng_lib.c

@@ -1,5 +1,5 @@
 /*
- * Copyright 2001-2018 The OpenSSL Project Authors. All Rights Reserved.
+ * Copyright 2001-2020 The OpenSSL Project Authors. All Rights Reserved.
  *
  * Licensed under the Apache License 2.0 (the "License").  You may not use
  * this file except in compliance with the License.  You can obtain a copy
@@ -171,6 +171,7 @@ void engine_cleanup_int(void)
         cleanup_stack = NULL;
     }
     CRYPTO_THREAD_lock_free(global_engine_lock);
+    global_engine_lock = NULL;
 }
 
 /* Now the "ex_data" support */