case-anon-cow-rand-mt: remove the /N for thread case

As with commit 37f440c6eb71("case-anon-cow-seq-mt: remove the /N for
thread case"), we do not need to decide the size by nr_task since this
is a thread mode test.

Signed-off-by: Aaron Lu <aaron.lu@intel.com>
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
1 file changed