drivers/net/: remove write-only "last_dev"

This patch removes write-only global "last_dev" variables from the
following drivers:
- a2065.c
- declance.c
- sunlance.c

Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

drivers/net/declance.c

@@ -773,8 +773,6 @@ static irqreturn_t lance_interrupt(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
-struct net_device *last_dev = 0;
-
 static int lance_open(struct net_device *dev)
 {
 	volatile u16 *ib = (volatile u16 *)dev->mem_start;
@@ -782,8 +780,6 @@ static int lance_open(struct net_device *dev)
 	volatile struct lance_regs *ll = lp->ll;
 	int status = 0;
 
-	last_dev = dev;
-
 	/* Stop the Lance */
 	writereg(&ll->rap, LE_CSR0);
 	writereg(&ll->rdp, LE_C0_STOP);