bug#55895: [PATCH] maint: Fix ptr_align signature to silence -Wmaybe-uninitialized

[Paul Eggert]

On 6/11/22 09:30, Anders Kaseorg wrote:
> A pointer to uninitialized (or zero-initialized) memory that won’t be 
> written is valid but not _useful_.

But in the example I gave, the memory *is* written to later.

A const * pointer lets a C program have a read-only window into memory 
that other parts of the program can write to, which can be a useful 
thing to have. In C and C++, "const *" doesn't mean a pointer to storage 
that does not change; it merely means a pointer that can't be used to 
write the referenced storage.