merge-ort: do leave trace2 region even if checkout fails
In
557ac0350d9 (merge-ort: begin performance work; instrument with
trace2_region_* calls, 2021-01-23), we added Trace2 instrumentation, but
in the error path that returns early, we forgot to tell Trace2 that
we're leaving the region. Let's fix that.
Pointed-out-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Reviewed-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>