OPENSSL_init_crypto(): check config return code correctly

It was assumed that the config functionality returned a boolean.
However, it may return a negative number on error, so we need to take
that into account.

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/8679)

crypto/init.c

@@ -670,7 +670,7 @@ int OPENSSL_init_crypto(uint64_t opts, const OPENSSL_INIT_SETTINGS *settings)
         ret = RUN_ONCE(&config, ossl_init_config);
         conf_settings = NULL;
         CRYPTO_THREAD_unlock(init_lock);
-        if (!ret)
+        if (ret <= 0)
             return 0;
     }