bcachefs: Fix for hash_redo_key() in fsck

It's possible we're calling hash_redo_key() because of a duplicate key -
easiest fix for that is to just not use BCH_HASH_SET_MUST_CREATE.
Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/fsck.c

@@ -193,7 +193,7 @@ static int hash_redo_key(const struct bch_hash_desc desc,
 	bch2_trans_update(trans, k_iter, &delete, 0);
 
 	return bch2_hash_set(trans, desc, &h->info, k_iter->pos.inode,
-			     tmp, BCH_HASH_SET_MUST_CREATE);
+			     tmp, 0);
 }
 
 static int fsck_hash_delete_at(struct btree_trans *trans,