scheduler: don't allow killing idle task
scheduler: don't allow killing idle task

If someone tries to kill the idle task, ignore it.

Signed-off-by: Fabien Parent <2a93cde040adee823a667eed2882d05f12a84573@gmail.com>

mtitinger/phabos,mtitinger/phabos,gregkh/phabos,gregkh/phabos,fabo-corp/phabos,fabo-corp/phabos