drivers/net/atl1/atl1_main.c: remove unused variable

The variable update_rx is initialized but never used otherwise.

The semantic patch that makes this change is as follows:
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@@
type T;
identifier i;
constant C;
@@

(
extern T i;
|
- T i;
  <+... when != i
- i = C;
  ...+>
)
// </smpl>
Signed-off-by: NJulia Lawall <julia@diku.dk>
Acked-by: NJay Cliburn <jacliburn@bellsouth.net>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

drivers/net/atl1/atl1_main.c

@@ -1765,15 +1765,12 @@ static irqreturn_t atl1_intr(int irq, void *data)
 {
 	struct atl1_adapter *adapter = netdev_priv(data);
 	u32 status;
-	u8 update_rx;
 	int max_ints = 10;
 
 	status = adapter->cmb.cmb->int_stats;
 	if (!status)
 		return IRQ_NONE;
 
-	update_rx = 0;
-
 	do {
 		/* clear CMB interrupt status at once */
 		adapter->cmb.cmb->int_stats = 0;