reftable: release name on reftable_reader_new() error

If block_source_read_block() or parse_footer() fail, we leak the "name"
member of struct reftable_reader in reftable_reader_new().  Release it.

Reported by: H Z <[email protected]>
Helped-by: Jeff King <[email protected]>
Signed-off-by: René Scharfe <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: rscharfe

reftable/reader.c

@@ -666,6 +666,8 @@ int reftable_reader_new(struct reftable_reader **out,
 	reftable_block_done(&footer);
 	reftable_block_done(&header);
 	if (err) {
+		if (r)
+			reftable_free(r->name);
 		reftable_free(r);
 		block_source_close(source);
 	}