pack-bitmap.c: teach show_objects_for_type() about incremental MIDXs

Since we may ask for a pack_id that is in an earlier MIDX layer relative
to the one corresponding to our bitmap, use nth_midxed_pack() instead of
accessing the ->packs array directly.

Signed-off-by: Taylor Blau <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: ttaylorr

pack-bitmap.c

@@ -1631,7 +1631,7 @@ static void show_objects_for_type(
 				nth_midxed_object_oid(&oid, m, index_pos);
 
 				pack_id = nth_midxed_pack_int_id(m, index_pos);
-				pack = bitmap_git->midx->packs[pack_id];
+				pack = nth_midxed_pack(bitmap_git->midx, pack_id);
 			} else {
 				index_pos = pack_pos_to_index(bitmap_git->pack, pos + offset);
 				ofs = pack_pos_to_offset(bitmap_git->pack, pos + offset);