tests: Cleanup OpenSSL in the forked server processes

Signed-off-by: Jakub Jelen <jjelen@redhat.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>

tests/server/test_server/testserver_common.c

@@ -0,0 +1,36 @@
+/*
+ * This file is part of the SSH Library
+ *
+ * Copyright (c) 2025 by Red Hat, Inc.
+ *
+ * Author: Jakub Jelen <jjelen@redhat.com>
+ *
+ * The SSH Library is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or (at your
+ * option) any later version.
+ *
+ * The SSH Library is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+ * License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with the SSH Library; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ */
+
+#include "testserver_common.h"
+
+#if defined(HAVE_LIBCRYPTO) || defined(WITH_GSSAPI)
+/* for OPENSSL_cleanup() of GSSAPI's OpenSSL context */
+#include <openssl/crypto.h>
+#endif
+
+void finalize_openssl(void)
+{
+#if defined(HAVE_LIBCRYPTO) || defined(WITH_GSSAPI)
+    OPENSSL_cleanup();
+#endif
+}