commit-graph: fix the_repository reference

The parse_commit_buffer() method takes a repository pointer, so it
should not refer to the_repository anymore.

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

commit.c

@@ -443,7 +443,7 @@ int parse_commit_buffer(struct repository *r, struct commit *item, const void *b
 	item->date = parse_commit_date(bufptr, tail);
 
 	if (check_graph)
-		load_commit_graph_info(the_repository, item);
+		load_commit_graph_info(r, item);
 
 	return 0;
 }