In commit-graph.c:graph_write(), if read_one_commit() failed,
progress allocated in start_delayed_progress() will leak. Add
stop_progress() before goto cleanup.
Signed-off-by: Lidong Yan <502024330056@smail.nju.edu.cn> Acked-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>