Fix flaky stat.cc test.
Fix flaky stat.cc test.

This test flaked on my current CL. Linux makes no guarantee
that two inodes will consecutive (overflows happen).

https://github.com/avagin/linux-task-diag/blob/master/fs/inode.c#L880

PiperOrigin-RevId: 260608240

google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor