bcachefs: fix bch2_acl_chmod()

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/acl.c

@@ -377,6 +377,7 @@ int bch2_acl_chmod(struct btree_trans *trans,
 		goto err;
 	}
 
+	new->k.p = iter->pos;
 	bch2_trans_update(trans, BTREE_INSERT_ENTRY(iter, &new->k_i));
 	*new_acl = acl;
 	acl = NULL;