bcachefs: Fix leakage of internal error code

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

fs/bcachefs/journal_io.c

@@ -408,8 +408,10 @@ static int journal_entry_btree_root_validate(struct bch_fs *c,
 		return 0;
 	}
 
-	return journal_validate_key(c, jset, entry, 1, entry->btree_id, k,
-				    version, big_endian, flags);
+	ret = journal_validate_key(c, jset, entry, 1, entry->btree_id, k,
+				   version, big_endian, flags);
+	if (ret == FSCK_DELETED_KEY)
+		ret = 0;
 fsck_err:
 	return ret;
 }