Adapt prototype of net_accept() for explicit size
diff --git a/programs/test/udp_proxy.c b/programs/test/udp_proxy.c
index 28b5eaa..4052668 100644
--- a/programs/test/udp_proxy.c
+++ b/programs/test/udp_proxy.c
@@ -534,7 +534,8 @@
     mbedtls_printf( "  . Waiting for a remote connection ..." );
     fflush( stdout );
 
-    if( ( ret = mbedtls_net_accept( listen_fd, &client_fd, NULL ) ) != 0 )
+    if( ( ret = mbedtls_net_accept( listen_fd, &client_fd,
+                                    NULL, 0, NULL ) ) != 0 )
     {
         mbedtls_printf( " failed\n  ! mbedtls_net_accept returned %d\n\n", ret );
         goto exit;