platform/x86: intel-vbtn: Log event code on unexpected button events

When logging the warning about receiving a button event on a device
without buttons log the event code which triggered the warning.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Link: https://lore.kernel.org/r/20240327195712.43851-1-hdegoede@redhat.com

drivers/platform/x86/intel/vbtn.c

@@ -158,7 +158,8 @@ static void notify_handler(acpi_handle handle, u32 event, void *context)
 
 	if ((ke = sparse_keymap_entry_from_scancode(priv->buttons_dev, event))) {
 		if (!priv->has_buttons) {
-			dev_warn(&device->dev, "Warning: received a button event on a device without buttons, please report this.\n");
+			dev_warn(&device->dev, "Warning: received 0x%02x button event on a device without buttons, please report this.\n",
+				 event);
 			return;
 		}
 		input_dev = priv->buttons_dev;