fix build under linux 6.2

The signature for the devnode callback changed
to a const pointer.

src/keymash.c

@@ -67,7 +67,7 @@ static const struct file_operations keymash_fops = {
 	.read = keymash_read,
 };
 
-static char *keymash_devnode(struct device *dev, umode_t *mode)
+static char *keymash_devnode(const struct device *dev, umode_t *mode)
 {
 	if (mode)
 		*mode = 0444;
@@ -130,6 +130,5 @@ static void keymash_exit(void)
 	class_destroy(keymash_class);
 	cdev_del(&keymash_cdev);
 	unregister_chrdev_region(keymash_dev, KEYMASH_MINOR_COUNT);
-	keymash_info("sayounara sekai UwU\n");
 }
 module_exit(keymash_exit);