USB: ftdi_sio: remove unused tx_bytes counter

Remove counter that is never exported.

Signed-off-by: Johan Hovold <jhovold@gmail.com>
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 9668647..9594e35 100644
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -88,7 +88,6 @@
 
 	unsigned int latency;		/* latency setting in use */
 	spinlock_t tx_lock;	/* spinlock for transmit state */
-	unsigned long tx_bytes;
 	unsigned long tx_outstanding_bytes;
 	unsigned long tx_outstanding_urbs;
 	unsigned short max_packet_size;
@@ -1729,10 +1728,6 @@
 
 	dbg("%s", __func__);
 
-	spin_lock_irqsave(&priv->tx_lock, flags);
-	priv->tx_bytes = 0;
-	spin_unlock_irqrestore(&priv->tx_lock, flags);
-
 	write_latency_timer(port);
 
 	/* No error checking for this (will get errors later anyway) */
@@ -1917,7 +1912,6 @@
 	} else {
 		spin_lock_irqsave(&priv->tx_lock, flags);
 		priv->tx_outstanding_bytes += count;
-		priv->tx_bytes += count;
 		spin_unlock_irqrestore(&priv->tx_lock, flags);
 	}