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kernel: fix wrong updatecpu() context regression

In the sched() function, the call to reprioritize()
must be done before we set up, as reprioritize()
calls updatecpu(), which determines if the process
was running or not based on p == up. So move
the call to runproc() itself.

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

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

@@ -206,8 +206,6 @@

 		return;

 	}

 	up = runproc();

-	if(up->edf == nil)

-		up->priority = reprioritize(up);

 	if(up != m->readied)

 		m->schedticks = m->ticks + HZ/10;

 	m->readied = nil;

@@ -352,6 +350,7 @@

 	int fairshare, n, load, ratio;

 	updatecpu(p);

+

 	load = MACHP(0)->load;

 	if(load == 0)

 		return p->basepri;

@@ -405,6 +404,7 @@

 	}

 	p->state = Ready;

 	p->priority = pri;

+

 	if(pri == PriEdf){

 		Proc *pp, *l;

@@ -640,6 +640,8 @@

 	if(edflock(p)){

 		edfrun(p, rq == &runq[PriEdf]);	/* start deadline timer and do admin */

 		edfunlock();

+	} else {

+		p->priority = reprioritize(p);

 	}

 	pt = proctrace;

 	if(pt != nil)

@@ -709,8 +711,9 @@

 	p->lastlock = nil;

 	p->lastilock = nil;

 	p->nlocks = 0;

-	p->delaysched = 0;

 	p->trace = 0;

+	p->preempted = 0;

+	p->delaysched = 0;

 	/* sched params */

 	p->mp = nil;

-- 

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