Merge branch 'ew/commit-reach-clean-up-flags-fix'

Fix a segfaulting loop.  The function and its caller may need
further clean-up.

* ew/commit-reach-clean-up-flags-fix:
  commit-reach: avoid NULL dereference

Author: gitster

commit-reach.c

@@ -809,8 +809,12 @@ int can_all_from_reach_with_flag(struct object_array *from,
 	clear_commit_marks_many(nr_commits, list, RESULT | assign_flag);
 	free(list);
 
-	for (i = 0; i < from->nr; i++)
-		from->objects[i].item->flags &= ~assign_flag;
+	for (i = 0; i < from->nr; i++) {
+		struct object *from_one = from->objects[i].item;
+
+		if (from_one)
+			from_one->flags &= ~assign_flag;
+	}
 
 	return result;
 }