sched/sched_releasetcb.c:  Fix an error handling case where a pthread start-up fails early, before the task type has been saved in the TCB.  It is safer to use the sched_releasetcb() task type argument instead of relying on the task type in the TCB to be valid.  Reported by David Sidrane

SAMA5: Add ADC-side of the logic to hook in timer/counter logic needed to drive  periodic ADC sampling