pack-bitmap: convert struct stored_bitmap to object_id

Convert struct stored_bitmap to use struct object_id.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

pack-bitmap.c

@@ -18,7 +18,7 @@
  * commit.
  */
 struct stored_bitmap {
-	unsigned char sha1[20];
+	struct object_id oid;
 	struct ewah_bitmap *root;
 	struct stored_bitmap *xor;
 	int flags;
@@ -181,9 +181,9 @@ static struct stored_bitmap *store_bitmap(struct bitmap_index *index,
 	stored->root = root;
 	stored->xor = xor_with;
 	stored->flags = flags;
-	hashcpy(stored->sha1, sha1);
+	oidread(&stored->oid, sha1);
 
-	hash_pos = kh_put_sha1(index->bitmaps, stored->sha1, &ret);
+	hash_pos = kh_put_sha1(index->bitmaps, stored->oid.hash, &ret);
 
 	/* a 0 return code means the insertion succeeded with no changes,
 	 * because the SHA1 already existed on the map. this is bad, there
@@ -1080,7 +1080,7 @@ int rebuild_existing_bitmaps(struct bitmap_index *bitmap_git,
 					    lookup_stored_bitmap(stored),
 					    rebuild)) {
 				hash_pos = kh_put_sha1(reused_bitmaps,
-						       stored->sha1,
+						       stored->oid.hash,
 						       &hash_ret);
 				kh_value(reused_bitmaps, hash_pos) =
 					bitmap_to_ewah(rebuild);