drivers/net: Remove alloc_etherdev error messages

alloc_etherdev has a generic OOM/unable to alloc message.
Remove the duplicative messages after alloc_etherdev calls.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/wireless/ipw2x00/libipw_module.c b/drivers/net/wireless/ipw2x00/libipw_module.c
index d5ef696..3adb240 100644
--- a/drivers/net/wireless/ipw2x00/libipw_module.c
+++ b/drivers/net/wireless/ipw2x00/libipw_module.c
@@ -150,10 +150,9 @@
 	LIBIPW_DEBUG_INFO("Initializing...\n");
 
 	dev = alloc_etherdev(sizeof(struct libipw_device) + sizeof_priv);
-	if (!dev) {
-		LIBIPW_ERROR("Unable to allocate network device.\n");
+	if (!dev)
 		goto failed;
-	}
+
 	ieee = netdev_priv(dev);
 
 	ieee->dev = dev;