submodule--helper: replace memset() with { 0 }-initialization
Use the less verbose { 0 }-initialization syntax rather than memset()
in builtin/submodule--helper.c, this doesn't make a difference in
terms of behavior, but as we're about to modify adjacent code makes
this more consistent, and lets us avoid worrying about when the
memset() happens v.s. a "goto cleanup".
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Reviewed-by: Glen Choo <chooglen@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>