drivers/net/hamradio: fix sparse warning: symbol shadows an earlier one

Impact: Rename inner scrope variable.

Fix this sparse warning:
  drivers/net/hamradio/yam.c:856:35: warning: symbol 'dev' shadows an earlier one
Signed-off-by: NHannes Eder <hannes@hanneseder.net>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/hamradio/yam.c

@@ -854,10 +854,10 @@ static int yam_open(struct net_device *dev)
 
 	/* Reset overruns for all ports - FPGA programming makes overruns */
 	for (i = 0; i < NR_PORTS; i++) {
-		struct net_device *dev = yam_devs[i];
+		struct net_device *yam_dev = yam_devs[i];
 
-		inb(LSR(dev->base_addr));
-		dev->stats.rx_fifo_errors = 0;
+		inb(LSR(yam_dev->base_addr));
+		yam_dev->stats.rx_fifo_errors = 0;
 	}
 
 	printk(KERN_INFO "%s at iobase 0x%lx irq %u uart %s\n", dev->name, dev->base_addr, dev->irq,