commit_list: support sha256

src/libgit2/commit_list.c

@@ -125,7 +125,7 @@ static int commit_quick_parse(
 	git_oid *parent_oid;
 	git_commit *commit;
 	git_commit__parse_options parse_opts = {
-		GIT_OID_SHA1,
+		walk->repo->oid_type,
 		GIT_COMMIT_PARSE_QUICK
 	};
 	size_t i;
@@ -176,7 +176,9 @@ int git_commit_list_parse(git_revwalk *walk, git_commit_list_node *commit)
 	if (cgraph_file) {
 		git_commit_graph_entry e;
 
-		error = git_commit_graph_entry_find(&e, cgraph_file, &commit->oid, GIT_OID_SHA1_SIZE);
+		error = git_commit_graph_entry_find(&e, cgraph_file,
+			&commit->oid, git_oid_size(walk->repo->oid_type));
+
 		if (error == 0 && git__is_uint16(e.parent_count)) {
 			size_t i;
 			commit->generation = (uint32_t)e.generation;