bcachefs: Free iterator in bch2_btree_delete_range_trans()

This is specifically to speed up bch2_inode_rm(), so that we're not
traversing iterators we're done with.
Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/btree_update_leaf.c

@@ -1187,7 +1187,7 @@ int bch2_btree_delete_range_trans(struct btree_trans *trans, enum btree_id id,
 		goto retry;
 	}
 
-	bch2_trans_iter_put(trans, iter);
+	bch2_trans_iter_free(trans, iter);
 	return ret;
 }