fix io_uring timeout_remove test on kernel 5.4

There is no grantee that `copy_cqes` will return exactly wait_nr number of cqes.
If there are ready cqes it can return > 0 but < wait_nr number of cqes.
7a1dbbd4f9Igor Anić committed on 11/8/2023, 5:25:29 PMparentbf0387b
1 file changedLine totals unavailable