delta: widen `create_delta_index()` parameter to `size_t`

The sole caller (`try_delta()` in builtin/pack-objects.c) passes an
`unsigned long`, which promotes safely, so no caller fixups are needed.
Splitting it out keeps the `diff_delta()`/`create_delta()` widening,
which does ripple to several callers, in its own commit.

Assisted-by: Opus 4.7
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

0 files changed, 0 insertions, 0 deletions