bcachefs: Don't strip rebalance_opts from indirect extents

Fix bch2_bkey_clear_needs_rebalance(): indirect extents are never
supposed to have bch_extent_rebalance stripped off, because that's how
we get the IO path options when we don't have the original inode it
belonged to.

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

Author: Kent Overstreet

fs/bcachefs/rebalance.c

@@ -309,7 +309,7 @@ static int bch2_bkey_clear_needs_rebalance(struct btree_trans *trans,
 					   struct btree_iter *iter,
 					   struct bkey_s_c k)
 {
-	if (!bch2_bkey_rebalance_opts(k))
+	if (k.k->type == KEY_TYPE_reflink_v || !bch2_bkey_rebalance_opts(k))
 		return 0;
 
 	struct bkey_i *n = bch2_bkey_make_mut(trans, iter, &k, 0);