Free works with NULL, but not all cleanup functions do. Instead of deciding whether to defer before or after the null check on a case-by-case basis based on whe

Free works with NULL, but not all cleanup functions do. Instead of deciding whether to defer before or after the null check on a case-by-case basis based on whether the cleanup function handles NULL gracefully, I would just always do the defer after the null check regardless of which pair of allocation/cleanup functions I use.