[PATCH] malloc: Improve checked_request2size

[Paul Eggert]

On 6/6/25 12:44, Cristian Rodríguez wrote:
> PTRDIFF_MAX + 1 is a nice way to say "it cannot be handled"

OK, but SIZE_MAX also says it nicely, and on x86-64 at least SIZE_MAX is 
a bit more efficient because the instruction represents -1 more 
compactly than 2**63.

> maybe adding a constant explaining that fact is better.

Yes, that'd be good regardless of the constant's value.