[PATCH 02/12] delta: widen `create_delta_index()` parameter to `size_t`

["Johannes Schindelin via GitGitGadget" <gitgitgadget@gmail.com>]

From: Johannes Schindelin <johannes.schindelin@gmx.de>

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>
---
 delta.h      | 2 +-
 diff-delta.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/delta.h b/delta.h
index eb5c6d2fdb..a19586d789 100644
--- a/delta.h
+++ b/delta.h
@@ -14,7 +14,7 @@ struct delta_index;
  * using free_delta_index().
  */
 struct delta_index *
-create_delta_index(const void *buf, unsigned long bufsize);
+create_delta_index(const void *buf, size_t bufsize);
 
 /*
  * free_delta_index: free the index created by create_delta_index()
diff --git a/diff-delta.c b/diff-delta.c
index b6b65d7607..c93ac42594 100644
--- a/diff-delta.c
+++ b/diff-delta.c
@@ -132,7 +132,7 @@ struct delta_index {
 	struct index_entry *hash[FLEX_ARRAY];
 };
 
-struct delta_index * create_delta_index(const void *buf, unsigned long bufsize)
+struct delta_index * create_delta_index(const void *buf, size_t bufsize)
 {
 	unsigned int i, hsize, hmask, entries, prev_val, *hash_count;
 	const unsigned char *data, *buffer = buf;
-- 
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