[Bug libstdc++/65142] std::random_device Ignores Read Return Code

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65142

--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
And the check is wrong in the fread() case as it will only ever return 0 or 1.