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alarm: run checkalarms() only on cpu0 (from eriks alarm-once patch)

--- a/sys/src/9/port/alarm.c

+++ b/sys/src/9/port/alarm.c

@@ -37,7 +37,7 @@

 }

 /*

- *  called every clock tick

+ *  called every clock tick on cpu0

  */

 void

 checkalarms(void)

--- a/sys/src/9/port/portclock.c

+++ b/sys/src/9/port/portclock.c

@@ -153,7 +153,8 @@

 		exit(0);

 	}

-	checkalarms();

+	if(m->machno == 0)

+		checkalarms();

 	if(up && up->state == Running)

 		hzsched();	/* in proc.c */

-- 

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