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kernel: dont block allocating kstack for new processes

Have newproc() fail returning nil if we can't allocate
the kernel stack instead of locking up in smalloc().

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

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

@@ -634,7 +634,7 @@

 	lock(&procalloc);

 	p = procalloc.free;

-	if(p == nil){

+	if(p == nil || (p->kstack == nil && (p->kstack = malloc(KSTACK)) == nil)){

 		unlock(&procalloc);

 		return nil;

 	}

@@ -655,8 +655,6 @@

 	p->nlocks = 0;

 	p->delaysched = 0;

 	p->trace = 0;

-	if(p->kstack == nil)

-		p->kstack = smalloc(KSTACK);

 	/* sched params */

 	p->mp = nil;