z3fold: don't bother with dentry_operations

Don't bother with dentry_operations as no dentry is ever allocated.
Signed-off-by: David Howells <dhowells@redhat.com>

mm/z3fold.c

@@ -242,11 +242,7 @@ static inline void free_handle(unsigned long handle)
 static struct dentry *z3fold_do_mount(struct file_system_type *fs_type,
 				int flags, const char *dev_name, void *data)
 {
-	static const struct dentry_operations ops = {
-		.d_dname = simple_dname,
-	};
-
-	return mount_pseudo(fs_type, "z3fold:", NULL, &ops, 0x33);
+	return mount_pseudo(fs_type, "z3fold:", NULL, NULL, 0x33);
 }
 
 static struct file_system_type z3fold_fs = {