bcachefs: don't free error pointers

Reported-by: syzbot+3333603f569fc2ef258c@syzkaller.appspotmail.com
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/recovery.c

@@ -902,6 +902,7 @@ int bch2_fs_recovery(struct bch_fs *c)
 		bch2_journal_keys_put_initial(c);
 		bch2_find_btree_nodes_exit(&c->found_btree_nodes);
 	}
+	if (!IS_ERR(clean))
 		kfree(clean);
 
 	if (!ret &&