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nusb/serial: fix wrong guard statement (thanks deuteron)

--- a/sys/src/cmd/nusb/serial/serial.c

+++ b/sys/src/cmd/nusb/serial/serial.c

@@ -465,7 +465,7 @@

 	data = req->ifcall.data;

 	count = req->ifcall.count;

 	qlock(ser);

-	if(ser->wait4data != nil) {

+	if(ser->wait4write != nil) {

 		wcount = ser->wait4write(p, data, count);

 		qunlock(ser);

 	} else {

-- 

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