Move ssl_set_ca_chain() to work on config
diff --git a/programs/ssl/ssl_pthread_server.c b/programs/ssl/ssl_pthread_server.c
index e951b3a..1fc3262 100644
--- a/programs/ssl/ssl_pthread_server.c
+++ b/programs/ssl/ssl_pthread_server.c
@@ -188,7 +188,7 @@
                                    mbedtls_ssl_cache_set, thread_info->cache );
 #endif
 
-    mbedtls_ssl_set_ca_chain( &ssl, thread_info->ca_chain, NULL, NULL );
+    mbedtls_ssl_set_ca_chain( &conf, thread_info->ca_chain, NULL );
     if( ( ret = mbedtls_ssl_set_own_cert( &ssl, thread_info->server_cert, thread_info->server_key ) ) != 0 )
     {
         mbedtls_printf( " failed\n  ! mbedtls_ssl_set_own_cert returned %d\n\n", ret );