extra argument is not used, so remove it.  this makes
sched a little easier to reason about.

Reference: /n/atom/patch/applied/nixqproclock
Date: Sat Apr 19 16:19:07 CES 2014
Signed-off-by: quanstro@quanstro.net

--- /sys/src/nix/port/proc.c	Sat Apr 19 16:18:35 2014
+++ /sys/src/nix/port/proc.c	Sat Apr 19 16:18:35 2014
@@ -415,15 +415,12 @@
  * add a process to a scheduling queue
  */
 static void
-queueproc(Sched *sch, Schedq *rq, Proc *p, int locked)
+queueproc(Sched *sch, Schedq *rq, Proc *p)
 {
 	int pri;
 
 	pri = rq - sch->runq;
-	if(!locked)
-		lock(sch);
-//	else if(canlock(sch))
-//		panic("queueproc: locked and can lock");
+	lock(sch);
 	p->priority = pri;
 	p->rnext = 0;
 	if(rq->tail)
@@ -434,8 +431,7 @@
 	rq->n++;
 	sch->nrdy++;
 	sch->runvec |= 1<<pri;
-	if(!locked)
-		unlock(sch);
+	unlock(sch);
 }
 
 /*
@@ -485,7 +481,7 @@
 }
 
 static void
-schedready(Sched *sch, Proc *p, int locked)
+schedready(Sched *sch, Proc *p)
 {
 	Mpl pl;
 	int pri;
@@ -509,7 +505,7 @@
 	p->priority = pri;
 	rq = &sch->runq[pri];
 	p->state = Ready;
-	queueproc(sch, rq, p, locked);
+	queueproc(sch, rq, p);
 	if(p->trace)
 		proctrace(p, SReady, 0);
 	splx(pl);
@@ -522,7 +518,7 @@
 void
 ready(Proc *p)
 {
-	schedready(procsched(p), p, 0);
+	schedready(procsched(p), p);
 }
 
 /*
@@ -573,7 +569,7 @@
 			pl = splhi();
 			p = dequeueproc(sch, rq, p);
 			if(p)
-				queueproc(sch, &sch->runq[npri], p, 0);
+				queueproc(sch, &sch->runq[npri], p);
 			splx(pl);
 			goto another;
 		}