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kernel: fix cooperative scheduling for wired processes

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

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

@@ -425,7 +425,7 @@

 		return;

 	}

-	if(up != p)

+	if(up != p && (p->wired == nil || p->wired == MACHP(m->machno)))

 		m->readied = p;	/* group scheduling */

 	updatecpu(p);

@@ -511,6 +511,7 @@

 	/* cooperative scheduling until the clock ticks */

 	if((p=m->readied) && p->mach==0 && p->state==Ready

+	&& (p->wired == nil || p->wired == MACHP(m->machno))

 	&& runq[Nrq-1].head == nil && runq[Nrq-2].head == nil){

 		skipscheds++;

 		rq = &runq[p->priority];