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devether: use qfull() instead of qwindow()

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

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

@@ -133,7 +133,7 @@

 {

 	Block *bp;

-	if(qwindow(f->in) <= 0)

+	if(qfull(f->in))

 		return;

 	bp = iallocb(64);

 	if(bp == nil)