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sgi: get rid of timerset(0) case

--- a/sys/src/9/sgi/clock.c

+++ b/sys/src/9/sgi/clock.c

@@ -148,14 +148,10 @@

 {

 	long period;

-	if(next == 0)

+	period = next - fastticks(nil);

+	if(period < m->minperiod)

+		period = m->minperiod;

+	else if(period > m->maxperiod - m->minperiod)

 		period = m->maxperiod;

-	else {

-		period = next - fastticks(nil);

-		if(period > m->maxperiod)

-			period = m->maxperiod;

-		else if(period < m->minperiod)

-			period = m->minperiod;

-	}

 	wrcompare(rdcount()+period);

 }