charon-nm: Fix building list of DNS/MDNS servers with libnm

g_variant_builder_add() creates a new GVariant using g_variant_new() and
then adds it to the builder.  Passing a GVariant probably adds the
pointer to the array, not the value.  I think an alternative fix would
be to use "@u" as type string for the g_variant_builder_add() call, then
the already allocated GVariant is adopted.

Fixes: 9a71b7219c ("charon-nm: Port to libnm")

src/charon-nm/nm/nm_service.c

@@ -65,8 +65,7 @@ static GVariant* handler_to_variant(nm_handler_t *handler,
 	enumerator = handler->create_enumerator(handler, type);
 	while (enumerator->enumerate(enumerator, &chunk))
 	{
-		g_variant_builder_add (&builder, "u",
+		g_variant_builder_add (&builder, "u", *(uint32_t*)chunk.ptr);
-							   g_variant_new_uint32 (*(uint32_t*)chunk.ptr));
 	}
 	enumerator->destroy(enumerator);