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nusb/serial: remove unused channel

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

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

@@ -31,8 +31,6 @@

 			chanclose(p->w4data);

 		if(p->gotdata != nil)

 			chanclose(p->gotdata);

-		if(p->readc)

-			chanclose(p->readc);

 	}

 }

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

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

@@ -62,7 +62,6 @@

 	Channel *w4data;

 	Channel *gotdata;

-	Channel *readc;		/* to uncouple reads, only used in ftdi... */

 	int	ndata;

 	uchar	data[DataBufSz];