USB: flow control fix for pl2303

in order to be able to switch back to 'flow-control none'
after having activated 'flow-control rts/cts', I made
a small change to 'pl2303.c'.
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/serial/pl2303.c

@@ -617,6 +617,13 @@ static void pl2303_set_termios(struct usb_serial_port *port,
 				    VENDOR_WRITE_REQUEST_TYPE,
 				    0x0, index, NULL, 0, 100);
 		dbg("0x40:0x1:0x0:0x%x  %d", index, i);
+	} else {
+		i = usb_control_msg(serial->dev,
+				    usb_sndctrlpipe(serial->dev, 0),
+				    VENDOR_WRITE_REQUEST,
+				    VENDOR_WRITE_REQUEST_TYPE,
+				    0x0, 0x0, NULL, 0, 100);
+		dbg ("0x40:0x1:0x0:0x0  %d", i);
 	}
 
 	kfree(buf);