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kernel: simplify procalarm()

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

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

@@ -83,24 +83,15 @@

 		}

 		l = &f->palarm;

 	}

-

-	up->palarm = 0;

-	if(alarms.head) {

-		l = &alarms.head;

-		for(f = *l; f; f = f->palarm) {

-			time = f->alarm;

-			if(time != 0 && (long)(time - when) >= 0) {

-				up->palarm = f;

-				*l = up;

-				goto done;

-			}

-			l = &f->palarm;

-		}

-		*l = up;

+	l = &alarms.head;

+	for(f = *l; f; f = f->palarm) {

+		time = f->alarm;

+		if(time != 0 && (long)(time - when) >= 0)

+			break;

+		l = &f->palarm;

 	}

-	else

-		alarms.head = up;

-done:

+	up->palarm = f;

+	*l = up;

 	up->alarm = when;

 	qunlock(&alarms);