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kernel: cleanup unused fields from devpipe

We don't need to multiply session path by 2, the definition
for NETQID is:

Meaning we don't need to save room between session paths
for individual Qid paths. This doubles the amount of
pipe sessions we can have before a wrap.

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

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

@@ -11,9 +11,7 @@

 struct Pipe

 {

 	QLock;

-	Pipe	*next;

 	int	ref;

-	ulong	path;

 	Queue	*q[2];

 	int	qref[2];

 };

@@ -57,6 +55,7 @@

 {

 	Pipe *p;

 	Chan *c;

+	ulong path;

 	c = devattach('|', spec);

 	if(waserror()){

@@ -82,10 +81,10 @@

 	poperror();

 	lock(&pipealloc);

-	p->path = ++pipealloc.path;

+	path = ++pipealloc.path;

 	unlock(&pipealloc);

-	mkqid(&c->qid, NETQID(2*p->path, Qdir), 0, QTDIR);

+	mkqid(&c->qid, NETQID(path, Qdir), 0, QTDIR);

 	c->aux = p;

 	c->dev = 0;

 	return c;