thunderbolt: Do not resume routers if UID is not set

Routers might not have a UID set if the DROM read failed during
initialization previously.

Normally upon resume the UID is re-read to confirm it's the same
device connected.
* If the DROM read failed during init but then succeeded during
resume it could either be a new device or faulty device
* If the DROM read failed during init and also failed during resume
it might be a different device plugged in all together.

Detect this situation and prevent re-using the same configuration in
these cirucmstances.

Signed-off-by: Mario Limonciello <[e-mail]>
Signed-off-by: Mika Westerberg <[e-mail]>

drivers/thunderbolt/switch.c

···
 			return err;
 		}
 
+		/* We don't have any way to confirm this was the same device */
+		if (!sw->uid)
+			return -ENODEV;
+
 		if (tb_switch_is_usb4(sw))
 			err = usb4_switch_read_uid(sw, &uid);
 		else