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kernel: remove error label in pgrpnote() arround postnote

postnote does not raise error, so the error label is not
neccesary.

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

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

@@ -24,20 +24,13 @@

 	memmove(buf, a, n);

 	buf[n] = 0;

 	p = proctab(0);

-	ep = p+conf.nproc;

-	for(; p < ep; p++) {

+	for(ep = p+conf.nproc; p < ep; p++) {

 		if(p->state == Dead)

 			continue;

 		if(up != p && p->noteid == noteid && p->kp == 0) {

 			qlock(&p->debug);

-			if(p->pid == 0 || p->noteid != noteid){

-				qunlock(&p->debug);

-				continue;

-			}

-			if(!waserror()) {

+			if(p->pid != 0 && p->noteid == noteid)

 				postnote(p, 0, buf, flag);

-				poperror();

-			}

 			qunlock(&p->debug);

 		}

 	}

-- 

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