fruit: disable useless size_t overflow check

fruit: disable useless size_t overflow check

Bug-Debian: http://bugs.debian.org/974868
Forwarded: https://gitlab.com/samba-team/samba/-/merge_requests/3872

As has been said several times in
https://bugzilla.samba.org/show_bug.cgi?id=13622 ,
the check 'bandsize > SIZE_MAX/nbands' is useless.  But it
is also wrong, in 2 ways: first, nbands might be 0 (when
no bands has been allocated yet), and second, there's no
point in comparing this with SIZE_MAX, since size_t on 32bit
platforms is a 32bit integer, while bandsize is off_t which
is 64bits (samba always enables LFS).

This check causes the module to fail when bandsize*nbands
exceeds 32bits, which has been reported for example at
https://bugs.debian.org/974868 .

Whole thing can't overflow because it is already guarded
by time_machine_max_size.  Or at the very least, by current
disk sizes... :)

Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Gbp-Pq: Name fruit-disable-useless-size_t-overflow-check.patch