window: Use xzalloc() instead of silently failing to add output
diff --git a/clients/window.c b/clients/window.c
index ce75f0c..84d3e73 100644
--- a/clients/window.c
+++ b/clients/window.c
@@ -4791,10 +4791,7 @@
 {
 	struct output *output;
 
-	output = zalloc(sizeof *output);
-	if (output == NULL)
-		return;
-
+	output = xzalloc(sizeof *output);
 	output->display = d;
 	output->scale = 1;
 	output->output =