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fix spurious kproc ppid

newproc() didnt zero parentpid and kproc() didnt set it, so
kprocs ended up with random parent pid. this is harmless as
kprocs have no up->parent but it gives confusing results in
pstree(1).

now we zero parentpid in newproc(), and set it in sysrfork()
unless RFNOWAIT has been set.

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

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

@@ -644,6 +644,7 @@

 	p->nargs = 0;

 	p->setargs = 0;

 	memset(p->seg, 0, sizeof p->seg);

+	p->parentpid = 0;

 	p->noteid = pidalloc(p);

 	if(p->kstack == 0)

 		p->kstack = smalloc(KSTACK);

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

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

@@ -169,10 +169,8 @@

 	forkchild(p, up->dbgreg);

 	p->parent = up;

-	p->parentpid = up->pid;

-	if(flag&RFNOWAIT)

-		p->parentpid = 0;

-	else {

+	if((flag&RFNOWAIT) == 0){

+		p->parentpid = up->pid;

 		lock(&up->exl);

 		up->nchild++;

 		unlock(&up->exl);

-- 

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