[Bug c/70813] Wrong warning "'0' flag ignored with precision and ‘%d’ gnu_printf format"

[ch3root at openwall dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70813

--- Comment #1 from Alexander Cherepanov <ch3root at openwall dot com> ---
Wrong position of this warning seems to be a separate issue, so I filed it as
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70813 . This PR is about the fact
that this warning is emitted at all in this corner case.