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devproc: check for p->dot == nil, run closeproc with up->dot = up->slash

p->dot can be nil when process exits (see pexit())

set closeprocs dot to up->slash so it will show up
right in devproc.

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

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

@@ -535,7 +535,7 @@

 	if(up != 0 && palloc.Lock.p != up && canqlock(&clunkq.q)){

 		c = up->dot;

-		up->dot = nil;

+		up->dot = up->slash;	/* dummy */

 		if(!waserror()){

 			kproc("closeproc", closeproc, nil);

 			poperror();

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

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

@@ -571,7 +571,7 @@

 	eqlock(&p->debug);

 	f = p->fgrp;

-	if(f == nil){

+	if(f == nil || p->dot == nil){

 		qunlock(&p->debug);

 		return 0;

 	}

@@ -956,7 +956,7 @@

 			qunlock(&p->debug);

 			nexterror();

 		}

-		if(p->pgrp == nil || p->pid != PID(c->qid))

+		if(p->pgrp == nil || p->dot == nil || p->pid != PID(c->qid))

 			error(Eprocdied);

 		mw = c->aux;

 		if(mw->cddone){

-- 

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