Fix a mem leak in ssl_test_ctx.c

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2650)

test/ssl_test_ctx.c

diff --git a/test/ssl_test_ctx.c b/test/ssl_test_ctx.c
index 1f3495f..c5b9a3e 100644
--- a/test/ssl_test_ctx.c
+++ b/test/ssl_test_ctx.c
@@ -585,6 +585,7 @@
     OPENSSL_free(conf->client.alpn_protocols);
     OPENSSL_free(conf->server.alpn_protocols);
     OPENSSL_free(conf->server2.alpn_protocols);
+    OPENSSL_free(conf->client.reneg_ciphers);
 }
 
 static void ssl_test_ctx_free_extra_data(SSL_TEST_CTX *ctx)