branch.c: use ref transaction for all ref updates
Change create_branch to use a ref transaction when creating the new branch. This also fixes a race condition in the old code where two concurrent create_branch could race since the lock_any_ref_for_update/write_ref_sha1 did not protect against the ref already existing. I.e. one thread could end up overwriting a branch even if the forcing flag 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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