builtin/submodule--helper.c: rename option struct to "opt"
In a later commit, update_clone()'s options will be stored in a struct
update_data instead of submodule_update_clone. Preemptively rename the
options struct to "opt" to shrink that commit's diff.
Helped-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Glen Choo <chooglen@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>