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devpipe: remove bogus "wstat on closed pipe" note

This cannot happen ever. qsetlimit() will never
raise an error and it would only go into the waserror()
case when invalid argument checks fail.

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

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

@@ -371,13 +371,6 @@

 	Dir d;

 	Pipe *p;

-	if(waserror()){

-		/* avoid notes when pipe is a mounted queue */

-		if((c->flag & CMSG) == 0)

-			postnote(up, 1, "sys: wstat on closed pipe", NUser);

-		nexterror();

-	}

-

 	n = convM2D(dp, n, &d, nil);

 	if(n == 0)

 		error(Eshortstat);

@@ -397,7 +390,6 @@

 		panic("pipewstat");

 	}

-	poperror();

 	return n;

 }