pack-objects: use object_id in packlist_alloc()

The only caller of packlist_alloc() already has a "struct object_id",
and we immediately copy the hash they pass us into our own object_id.
Let's avoid the unnecessary round-trip to a raw sha1 pointer.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/pack-objects.c

@@ -1147,7 +1147,7 @@ static void create_object_entry(const struct object_id *oid,
 {
 	struct object_entry *entry;
 
-	entry = packlist_alloc(&to_pack, oid->hash, index_pos);
+	entry = packlist_alloc(&to_pack, oid, index_pos);
 	entry->hash = hash;
 	oe_set_type(entry, type);
 	if (exclude)

pack-objects.c

@@ -153,7 +153,7 @@ void prepare_packing_data(struct repository *r, struct packing_data *pdata)
 }
 
 struct object_entry *packlist_alloc(struct packing_data *pdata,
-				    const unsigned char *sha1,
+				    const struct object_id *oid,
 				    uint32_t index_pos)
 {
 	struct object_entry *new_entry;
@@ -177,7 +177,7 @@ struct object_entry *packlist_alloc(struct packing_data *pdata,
 	new_entry = pdata->objects + pdata->nr_objects++;
 
 	memset(new_entry, 0, sizeof(*new_entry));
-	hashcpy(new_entry->idx.oid.hash, sha1);
+	oidcpy(&new_entry->idx.oid, oid);
 
 	if (pdata->index_size * 3 <= pdata->nr_objects * 4)
 		rehash_objects(pdata);

pack-objects.h

@@ -183,7 +183,7 @@ static inline void packing_data_unlock(struct packing_data *pdata)
 }
 
 struct object_entry *packlist_alloc(struct packing_data *pdata,
-				    const unsigned char *sha1,
+				    const struct object_id *oid,
 				    uint32_t index_pos);
 
 struct object_entry *packlist_find(struct packing_data *pdata,