output: correctly handle outputs without a test() impl

This fixes a crash when calling wlr_output_test() on a headless output. Closes: swaywm/sway#6213
swaywm · Apr 21, 2021 · 6622cd3 · 6622cd3
1 parent 8e375ae
commit 6622cd3
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/types/wlr_output.c b/types/wlr_output.c
@@ -580,6 +580,9 @@ bool wlr_output_test(struct wlr_output *output) {
 	if (!output_basic_test(output)) {
 		return false;
 	}
+	if (!output->impl->test) {
+		return true;
+	}
 	return output->impl->test(output);
 }