test: message: Fix message handling in MessageReceiver

Forward messages that we don't handle to the base Object class, to avoid
both blocking the ThreadMove message and mistaking it as the test
message.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

test/message.cpp

@@ -37,6 +37,11 @@ public:
 protected:
 	void message(Message *msg)
 	{
+		if (msg->type() != Message::None) {
+			Object::message(msg);
+			return;
+		}
+
 		if (thread() != Thread::current())
 			status_ = InvalidThread;
 		else