net:drivers/net: replace IS_ERR and PTR_ERR with PTR_ERR_OR_ZERO

This patch fixes coccinelle error regarding usage of IS_ERR and
PTR_ERR instead of PTR_ERR_OR_ZERO.
Signed-off-by: NDuan Jiong <duanj.fnst@cn.fujitsu.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/i825xx/82596.c

@@ -1527,9 +1527,7 @@ int __init init_module(void)
 	if (debug >= 0)
 		i596_debug = debug;
 	dev_82596 = i82596_probe(-1);
-	if (IS_ERR(dev_82596))
-		return PTR_ERR(dev_82596);
-	return 0;
+	return PTR_ERR_OR_ZERO(dev_82596);
 }
 
 void __exit cleanup_module(void)