linux(4): Prevent integer overflow in futex_requeue.

To prevent a signed integer overflow in futex_requeue add a sanity check
to catch negative values of nrwake or nrrequeue.

Approved by: so
Security: EN-21:22.linux_futex

(cherry picked from commit 25b09d6f398ea8a260ee8e2e8209fd76c61e13ee)
(cherry picked from commit 7a37d13b6cfa5235c88678f96ede6bfca74b28e8)