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kernel: keep one closeproc arround in case we are unable to fork a new one

closechanq() is unable to fork a new closeproc when palloc
is locked. so we spawn a closeproc early in chandevinit()
and make sure theres always one process arround to handle
the queue.

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

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

@@ -194,6 +194,8 @@

 		devtab[i]->reset();

 }

+static void closeproc(void*);

+

 void

 chandevinit(void)

 {

@@ -201,6 +203,7 @@

 	for(i=0; devtab[i] != nil; i++)

 		devtab[i]->init();

+	kproc("closeproc", closeproc, nil);

 }

 void

@@ -506,6 +509,8 @@

 		c = clunkq.head;

 		if(c == nil){

 			unlock(&clunkq.l);

+			if(canqlock(&clunkq.q))

+				continue;

 			pexit("no work", 1);

 		}

 		clunkq.head = c->next;

-- 

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