commit.c: use ref transactions for updates
Change commit.c to use ref transactions for all ref updates. Make sure we pass a NULL pointer to ref_transaction_update if have_old is false. Signed-off-by: NRonnie Sahlberg <sahlberg@google.com> Reviewed-by: NMichael Haggerty <mhagger@alum.mit.edu> Signed-off-by: NJonathan Nieder <jrnieder@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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