Use ctx2 instead ctx.

CLA: trivial
Reviewed-by: NMatt Caswell <matt@openssl.org>
Reviewed-by: NBen Kaduk <kaduk@mit.edu>
(Merged from https://github.com/openssl/openssl/pull/11372)

(cherry picked from commit 402b00d57921a0c8cd641b190d36bf39ea5fb592)

apps/s_server.c

@@ -1904,7 +1904,7 @@ int s_server_main(int argc, char *argv[])
         BIO_printf(bio_s_out, "Setting secondary ctx parameters\n");
 
         if (sdebug)
-            ssl_ctx_security_debug(ctx, sdebug);
+            ssl_ctx_security_debug(ctx2, sdebug);
 
         if (session_id_prefix) {
             if (strlen(session_id_prefix) >= 32)