Comment 12 for bug 2053134

```
When no size-index argument is specified, the pointer argument must be either null or point to a space that is suitably aligned and large for __at least one object__ of the referenced type (this implies that a past-the-end pointer is not a valid argument).
```

Well technically, the pointer argument *is* suitably aligned and large for 16 objects of 0 size, but the implication that it is hence not a past-the-end pointer is invalid. I'll drop the access attribute (since the additional value from having it is not really significant enough) but IMO -Wstringop-overflow needs to be fixed to handle pointers to zero-sized structs, i.e. it needs to ignore them and not conjure up an access size of 1 out of nowhere.