vt: keyboard: Don't process Unicode characters in K_OFF mode

We don't process Unicode characters if the virtual terminal is in raw
mode, so there's no reason why we shouldn't do the same for K_OFF
(especially since people would expect K_OFF to actually turn off all VT
key processing).

Fixes: 9fc3de9c8356 ("vt: Add virtual console keyboard mode OFF")
Signed-off-by: Myrrh Periwinkle <[e-mail]>
Cc: stable <[e-mail]>
Reviewed-by: Jiri Slaby <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/tty/vt/keyboard.c

···
 		rc = atomic_notifier_call_chain(&keyboard_notifier_list,
 						KBD_UNICODE, &param);
 		if (rc != NOTIFY_STOP)
-			if (down && !raw_mode)
+			if (down && !(raw_mode || kbd->kbdmode == VC_OFF))
 				k_unicode(vc, keysym, !down);
 		return;
 	}