[Gptfdisk-general] Correct printw specifier patch

[Nikolaos C. <nch...@gm...>]

Hello,

I noticed some warnings when compiling gdisk; the issue was that the
long long format was used to print unsigned 64-bit integers. This
warning is important because passing the wrong type to the
printf-family can invoke undefined behavior.

The patch I'm submitting should take care of this.

Regards,
Nikolaos Chatzikonstantinou