tests: fix eventbus_test.v

vlib/eventbus/eventbus.v

@@ -65,8 +65,10 @@ fn (pb mut Publisher) publish(name string, sender voidptr, args voidptr) {
 			if event.once {
 				pb.registry.events.delete(i)
 			}
-			if event.receiver != voidptr(0) {
-				event.handler(event.receiver, args, sender)
+			//
+			x := event.receiver
+			if x != 0 {
+				event.handler(x, args, sender)
 			} else {
 				event.handler(sender, args, voidptr(0))
 			}