USB: ftdi_sio.c:Fill TX field of the ftdi async_icount structure

Signed-off-by: Uwe Bonnes <bon@elektron.ikp.physik.tu-darmstadt.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index cb0ecd5..a865df81 100644
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -1918,6 +1918,7 @@
 			c = kfifo_out(&port->write_fifo, &buffer[i + 1], len);
 			if (!c)
 				break;
+			priv->icount.tx += c;
 			buffer[i] = (c << 2) + 1;
 			count += c + 1;
 		}
@@ -1925,6 +1926,7 @@
 	} else {
 		count = kfifo_out_locked(&port->write_fifo, dest, size,
 								&port->lock);
+		priv->icount.tx += count;
 	}
 
 	return count;