tg3: ethtool phys_id default

When asked to blink LEDs the tg3 driver behaves when using:
ethtool -p ethX
The default value for data is zero, and other drivers interpret this
as blink forever (or at least a really long time). The tg3 driver
interprets this as blink once. All drivers should have the same
behaviour.

Signed-off-by: Stephen Hemminger <[e-mail]>
Acked-by: Michael Chan <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/tg3.c

···
 		return -EAGAIN;
 
 	if (data == 0)
-		data = 2;
+		data = UINT_MAX / 2;
 
 	for (i = 0; i < (data * 2); i++) {
 		if ((i % 2) == 0)