Previously, there was a tiny chance that tickdelay(3) would return early or that it would fail to reinstate a previous alarm. - sys_setalarm(2) now returns TMR_NEVER instead of 0 for the time left if no previous alarm was set; - sys_setalarm(2) now also returns the current time, to allow the caller to determine whether it got an alarm notification for the alarm it set or for a previous alarm that has just gone off; - tickdelay(3) now makes use of these facilities. Change-Id: Id4f8fe19a61ca8574f43131964e6f0317f613f49
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