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kernel: remove dead case from devpipe

This code is checking the return of devwalk for
a walk resulting in a clone of an open pipe file. However,
devclone ensures that the chan we are cloning is not
currently open.

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

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

@@ -136,17 +136,6 @@

 		p = c->aux;

 		qlock(p);

 		p->ref++;

-		if(c->flag & COPEN){

-			print("channel open in pipewalk\n");

-			switch(NETTYPE(c->qid.path)){

-			case Qdata0:

-				p->qref[0]++;

-				break;

-			case Qdata1:

-				p->qref[1]++;

-				break;

-			}

-		}

 		qunlock(p);

 	}

 	return wq;