net: Initialize as many ethernet devices as possible

On devices that have their first network interface provided by a FPGA,
the initialization of further interfaces will fail if the FPGA is not
yet programmed. This leads to problems during factory setup when the
data is supposed to be loaded over secondary netowork interfaces.

To avoid this, use the uclass_{first,next}_device_check functions to
initialize as many ethernet devices as possible.

Signed-off-by: Mario Six <mario.six@gdsys.cc>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>

net/eth-uclass.c

@@ -395,7 +395,7 @@ int eth_initialize(void)
 	 * This is accomplished by attempting to probe each device and calling
 	 * their write_hwaddr() operation.
 	 */
-	uclass_first_device(UCLASS_ETH, &dev);
+	uclass_first_device_check(UCLASS_ETH, &dev);
 	if (!dev) {
 		printf("No ethernet found.\n");
 		bootstage_error(BOOTSTAGE_ID_NET_ETH_START);
@@ -424,7 +424,7 @@ int eth_initialize(void)
 
 			eth_write_hwaddr(dev);
 
-			uclass_next_device(&dev);
+			uclass_next_device_check(&dev);
 			num_devices++;
 		} while (dev);