util: use UINT64_MAX
util: use UINT64_MAX

Since we are checking the size of long and long long, use UINT64_MAX in
the fallback to be sure thre right size is being used.

lpereira/kmod,Distrotech/kmod,pmmccorm/kmod,Distrotech/kmod,lucasdemarchi/kmod,pmmccorm/kmod,pmmccorm/kmod,lpereira/kmod,lpereira/kmod,lucasdemarchi/kmod,Distrotech/kmod,lucasdemarchi/kmod