sched/semaphore/sem_tickwait.c: Fix nxsem_tickwait_uninterruptible end condition

nxsem_tickwait correctly sleeps more than 1 tick. But nxsem_tickwait_uninterruptible
may wake up to a signal (with -EINTR), in which case the tick + 1 must also
be taken into account. Otherwise the nxsem_tickwait_uninterruptible may
wake up 1 tick too early.

Also fix the nxsem_tickwait to return with -ETIMEDOUT if called with delay 0.
This is similar to e.g.  posix sem_timedwait.

Signed-off-by: Jukka Laitinen <jukkax@ssrc.tii.ae>

sched/semaphore/sem_tickwait.c

@@ -100,8 +100,9 @@ int nxsem_tickwait(FAR sem_t *sem, uint32_t delay)
 
   if (delay == 0)
     {
-      /* Return the errno from nxsem_trywait() */
+      /* Timed out already before waiting */
 
+      ret = -ETIMEDOUT;
       goto out;
     }
 
@@ -149,7 +150,7 @@ out:
 
 int nxsem_tickwait_uninterruptible(FAR sem_t *sem, uint32_t delay)
 {
-  clock_t end = clock_systime_ticks() + delay;
+  clock_t end = clock_systime_ticks() + delay + 1;
   int ret;
 
   for (; ; )