roccat: break infinite loops

When waiting for a status, the mouse sometimes answers 0x02, which seems
to be EINVAL (though it can be an ACK too). Treat this answer so we do
not end up in some infinite loops.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>

src/driver-roccat.c

@@ -277,6 +277,9 @@ roccat_is_ready(struct ratbag_device *device)
 	if (buf[1] == 0x03)
 		msleep(100);
 
+	if (buf[1] == 0x02)
+		return -EINVAL;
+
 	return buf[1] == 0x01;
 }