Returns number of unconsumed ready entries in the CQ
ring
# DESCRIPTION
The [io_uring_cq_ready] function returns the number of unconsumed
entries that are ready belonging to the *ring* param.
# RETURN VALUE
Returns the number of unconsumed ready entries in the CQ ring.
# SEE ALSO
[io_uring_submit], [io_uring_wait_cqe]