cgroup2: io: handle 64-bit values correctly on 32-bit architectures
cgroup2: io: handle 64-bit values correctly on 32-bit architectures

strconv.ParseUint(..., 0) is not really safe, because on 32-bit
architectures it will trigger runtime errors when trying to parse large
numbers (which in the case of the cgroupv2 io controller, is almost
certainly going to happen).

Fixes: 1932917b716d ("libcontainer: add initial support for cgroups v2")
Signed-off-by: Aleksa Sarai <b305c9b0212d6145eea67bbffd24e29cb79c759c@cyphar.com>

opencontainers/runc,kolyshkin/runc,rhatdan/runc,opencontainers/runc,kolyshkin/runc,dqminh/runc,dqminh/runc,rhatdan/runc,rhatdan/runc,opencontainers/runc,kolyshkin/runc,dqminh/runc,kolyshkin/runc,dqminh/runc,rhatdan/runc,opencontainers/runc