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limit clunk queue length for cclose()

dont let the clunk queue grow too large if we are allowed to
block (cclose) as the fileserver might run out of fids.

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

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

@@ -476,8 +476,8 @@

 struct {

 	Chan *head;

 	Chan *tail;

-	int nqueued;

-	int nclosed;

+	ulong nqueued;

+	ulong nclosed;

 	Lock l;

 	QLock q;

 	Rendez r;

@@ -555,7 +555,8 @@

 	if(devtab[c->type]->dc == L'M')

 	if((c->flag&(CRCLOSE|CCACHE)) == CCACHE)

-	if((c->qid.type&(QTEXCL|QTMOUNT|QTAUTH)) == 0){

+	if((c->qid.type&(QTEXCL|QTMOUNT|QTAUTH)) == 0)

+	if((clunkq.nqueued - clunkq.nclosed) < 64){

 		closechanq(c);

 		return;

 	}

-- 

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