Remove inaccurate comment claiming you could pass NULL to tbm_iterate()
From inspection it seems like doing that will always cause a segfault;
there are no NULL checks before assigning to that struct's members.
@@ -690,8 +690,6 @@ tbm_iterate_page(PagetableEntry *page, TBMIterateResult *output)
* remember the exact tuples to look at on this page --- the caller must
* examine all tuples on the page and check if they meet the intended
* condition.
- *
- * If 'output' is NULL, simple advance the HashBitmap by one.
*/
static bool
tbm_iterate_hash(HashBitmap *tbm, TBMIterateResult *output)
