asus-laptop: log unknown keys

Signed-off-by: Corentin Chary <corentin.chary@gmail.com>
Signed-off-by: Matthew Garrett <mjg@redhat.com>

drivers/platform/x86/asus-laptop.c

@@ -1364,8 +1364,10 @@ err_btrfk:
  */
 static void asus_input_notify(struct asus_laptop *asus, int event)
 {
-	if (asus->inputdev)
-		sparse_keymap_report_event(asus->inputdev, event, 1, true);
+	if (!asus->inputdev)
+		return ;
+	if (!sparse_keymap_report_event(asus->inputdev, event, 1, true))
+		pr_info("Unknown key %x pressed\n", event);
 }
 
 static int asus_input_init(struct asus_laptop *asus)