[PATCH] USB: ftdi_sio.c: not unlinking urb on ftdi_close

This patch fixes a bug in ftdi_sio.c where the driver wouldn't unlink the
read urb if the user application cleared the HUPCL flag on termios->c_cflag.

drivers/usb/serial/ftdi_sio.c

@@ -1362,14 +1362,15 @@ static void ftdi_close (struct usb_serial_port *port, struct file *filp)
 			if (set_rts(port, LOW) < 0) {
 				err("Error from RTS LOW urb");
 			}
+		} /* Note change no line if hupcl is off */
+		
 		/* shutdown our bulk read */
 		if (port->read_urb) {
-				usb_unlink_urb (port->read_urb);	
+			if (usb_unlink_urb (port->read_urb) < 0) {
+				err("Error unlinking read urb");
+			}
 		}
-			/* unlink the running write urbs */
-			
 
-		} /* Note change no line is hupcl is off */
 	} /* if (serial->dev) */