mg_printf_data was ignored if mg_destroy_server was called directly after

mongoose.c

@@ -3536,6 +3536,7 @@ void mg_destroy_server(struct mg_server **server) {
   struct ll *lp, *tmp;
 
   if (server != NULL && *server != NULL) {
+    mg_poll_server(*server, 0);
     closesocket((*server)->listening_sock);
     closesocket((*server)->ctl[0]);
     closesocket((*server)->ctl[1]);